kingkreeton
Contributor
Posts: 459
Loc: Wilmington NC
Reg: 04-15-11
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04-29-12 07:01 AM - Post#2220168
My fan hits/nicks the shroud at very high rpms. It appears that the shroud brackets are bent a little. After determining no further adjustments to the fan shroud can make any significant difference, I am debating grinding about 1/8 inch off each fan blade. I looks like only one fan blade is actually hitting, but I figure I would do them all just in case. Will doing this cause any significant cooling issues? I will eventually buy a new shroud but not on top of my list at this point. Thoughts?
Shane
64 Impala SS: 350 4 speed |
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doubleE
Valued Contributor
Posts: 3688
Loc: Eagan MN
Reg: 06-02-03
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04-29-12 07:15 AM - Post#2220174
In response to kingkreeton
I wouldbe very carfull about grinding the fan blade. You would not want to get it out of balance. Perhaps the motor mounts are shot, allowing too much movement of the engine?
Eric
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My Blue 62
Impala SS |
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ARKAR
Contributor
Posts: 580
Loc: Arkansas
Reg: 01-26-09
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04-29-12 07:53 AM - Post#2220187
In response to doubleE
Where is the fan striking the shroud? Top or bottom?
Keith
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 dcairns
"4th Year" Silver Supporting Member
Posts: 1539
Loc: Orange CA
Reg: 11-07-03
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04-29-12 08:21 AM - Post#2220196
In response to ARKAR
I was going the other direction, trying to get a closer fit between fan and shroud for better A/C performance. I discovered that fans were made by several vendors and varied in diameter. You may want to find an original or repro that is a bit smaller and solve your problem that way
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 rrausch
"12th Year" Silver Supporting Member
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04-29-12 08:52 AM - Post#2220212
In response to dcairns
I really discourage you from grinding on the fan blades. Really.
1953 210 Convertible, 261 with dual Carter YF 966S carbs, P.S., Remote Bendix P.B. Booster... shade-tree restoration about done.
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 sz0k30
"5th Year" Silver Supporting Member
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04-29-12 09:41 AM - Post#2220225
In response to kingkreeton
Grinding fan blades - STUPID idea.
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kingkreeton
Contributor
Posts: 459
Loc: Wilmington NC
Reg: 04-15-11
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04-29-12 10:06 AM - Post#2220232
In response to doubleE
Motor mounts are less than 2 years old and it is hitting the top of the shroud. It only does it after the engine is good and warm which makes me think the fan clutch disengages and it hits the top of the shroud once that happens and the RPMs jump suddenly. It seems only one blade hits the top. It may be bent, hard to tell. I can try and find a slightly smaller fan. Thanks for the input.
Shane
64 Impala SS: 350 4 speed |
Edited by kingkreeton on 04-29-12 10:06 AM. Reason for edit: No reason given.
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ARKAR
Contributor
Posts: 580
Loc: Arkansas
Reg: 01-26-09
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04-29-12 10:44 AM - Post#2220242
In response to kingkreeton
What about the tranny mount? Could it be too low and thus the fan is higher than it should be? Might check it out.
Keith
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impala
Senior Member
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04-29-12 12:39 PM - Post#2220281
In response to kingkreeton
Since you're eventually getting a new shroud I would just bend up the old one for clearance.
you're saying only 1/8" so it won't take much. Probably pulling up with both hands would be enough.
impala
61 Impala Convertible, AACA senior
94 Jaguar, XJS, V12 coupe
11 Silverado
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dcairns
"4th Year" Silver Supporting Member
Posts: 1539
Loc: Orange CA
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04-29-12 12:43 PM - Post#2220283
In response to impala
Or you could oval the holes that mount the shroud to the radiator support. But like Akar said, if it is not centered, then something is wrong in the mounts of the engine/transmission.
Edited by dcairns on 04-29-12 12:43 PM. Reason for edit: No reason given.
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arnieg141
Dedicated Enthusiast
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Loc: nj
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04-29-12 01:52 PM - Post#2220300
In response to dcairns
you sure water pump is ok it might only bobble at high revs. bad shaft or bearing ..
| GET ER DONE .. AS I GET OLDER I LIKE FAST CARS I CAN STILL DRIVE. AND VERY SLOW WOMEN I CAN CATCH while still able..arnie garrison |
Edited by arnieg141 on 04-29-12 02:18 PM. Reason for edit: No reason given.
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ARKAR
Contributor
Posts: 580
Loc: Arkansas
Reg: 01-26-09
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04-29-12 02:06 PM - Post#2220305
In response to arnieg141
Might need to clarify which set of holes the tranny crossmember utilizes. I'm at work so I can't look on my car and can't remember. Anyone remember which ones? This was asked and answered recently but I can't recall.
Keith
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kingkreeton
Contributor
Posts: 459
Loc: Wilmington NC
Reg: 04-15-11
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04-30-12 04:01 AM - Post#2220516
In response to ARKAR
Thanks for all the good replys. Engine and tranny mounts are all within two years old. I did not do the install so I cannot say whether it was done correctly. Looking at the engine mounts, it looks like there is only one way it fits so I am assuming that is correct. I could not crawl under the transmission yesterday but I will. If there is multiple hole locations, I would like to ensure it is installed correctly. My fan is certainly not centered. I have about a 2 inch gap at the bottom of the fan from the shroud and about a 1/2 - 1/4 inch gap at the top. See below:
I measured the fan that is currently installed and it measures at 17.5 in diameter. I may install a flex fan from Summit. They have 17" and 16" fans that may work until I can figure out why my fan is not centered. I'm afraid the 16" may be too small and cause overheating issues. Thoughts?
Ovaling the holes is an excellent idea that can hold me over until I find a permanent fix. When I mentioned the shroud's brackets being bent, it looks like they were bent on purpose by the previous owner for just this reason.
Pushing in on the brackets (not sure if that is right word) raises the fan shroud a bit. I could bend it some more but I really don't like that at all. I'll take a picture of the transmission mount and cross-member and maybe someone here can diagnosis an issue there.
The water pump is less than two years old. Would I be able to hear a bad bearing?
I don't think I have the shroud installed incorrectly when I replaced the radiator recently. Here is the holes that I'm using.
Thanks again for all the help and suggestions.
Shane
64 Impala SS: 350 4 speed |
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Kdurgin
"5th Year" Silver Supporting Member
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04-30-12 04:59 AM - Post#2220543
In response to kingkreeton
In the picture of the shroud mounts, it looks like a bolt was installed in the hole below where the bolt currently is. That would raise the shroud about an inch. Is the lower hole the same way? Is there an upper side to the shroud, or is it symetrical with the brackets? ie. flip it over?
62 Impala SS 383 Small Block, Tremec TKO 600, 3.70 gears. Black.
2011 Corvette Grand Sport dry sump 6 speed 436 H.P 2LT. Black.
1965 C-10 SWB BBW Fleetside Black.
2003 100th Anniversary Harley 2 tone Silver and Black Road King.
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kingkreeton
Contributor
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Loc: Wilmington NC
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04-30-12 05:05 AM - Post#2220546
In response to Kdurgin
I used that hole mistakenly when I put the replaced the radiator. The shroud was much to high and looked very wrong. I made the adjustment to its current position.
Shane
64 Impala SS: 350 4 speed |
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ARKAR
Contributor
Posts: 580
Loc: Arkansas
Reg: 01-26-09
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04-30-12 05:49 AM - Post#2220561
In response to kingkreeton
Ok, I have the exact same shroud. From what Verne Frantz posted months ago, these are "SS" only shrouds. Nothing is different but the little triangle brackets from what I can tell. Some, but not all, SS Impalas got them. Maybe only certain factories used them(?), I don't know. I do think the shroud is upside down. Just looked at mine and I don't think it will make a difference, but I would flip it over and see. I think the side mounting brackets are "centered" on the barrel, so I'm not sure that will help, but I'd flip it and see anyway. That's why it looks like the bolt is in the wrong hole. If you flip it over, the bottom bolt would be in that hole and I'm thinking that it originally was.
Edit to add: I think those SS shrouds are hard to find, I'd try to straighten it and keep it.
Keith
Edited by ARKAR on 04-30-12 05:59 AM. Reason for edit: No reason given.
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 turbo38s10
"3rd Year" Gold Supporting Member
Posts: 656
Loc: Agawam,MA
Reg: 09-17-09
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04-30-12 08:46 AM - Post#2220637
In response to ARKAR
I would guess also that the shroud is upside down. The overlap welded section I would think should be on the bottom.
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kingkreeton
Contributor
Posts: 459
Loc: Wilmington NC
Reg: 04-15-11
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04-30-12 08:55 AM - Post#2220641
In response to ARKAR
I will flip it and see if that makes a difference.
Shane
64 Impala SS: 350 4 speed |
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62sedan
Very Senior Member
Posts: 3330
Age: 62
Loc: North Dallas area
Reg: 08-12-02
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04-30-12 09:13 AM - Post#2220649
In response to kingkreeton
The overlap welded section I would think should be on the bottom.
Isn't it the same on both top and bottom of the hoop?? I know the shroud in my '62 is comprised of 2 half-circles welded together.
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ARKAR
Contributor
Posts: 580
Loc: Arkansas
Reg: 01-26-09
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04-30-12 09:34 AM - Post#2220657
In response to 62sedan
It is the same, it has seams on the top and bottom. Here's a picture of my SS shroud along side a '63 409 shroud.
I really don't think it'll make any difference when you flip the shroud, but it'll be right anyway.
Keith
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ARKAR
Contributor
Posts: 580
Loc: Arkansas
Reg: 01-26-09
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04-30-12 09:45 AM - Post#2220660
In response to kingkreeton
Motor mounts are less than 2 years old and it is hitting the top of the shroud. It only does it after the engine is good and warm which makes me think the fan clutch disengages and it hits the top of the shroud once that happens and the RPMs jump suddenly. It seems only one blade hits the top. It may be bent, hard to tell. I can try and find a slightly smaller fan. Thanks for the input.
After looking at the pictures you posted, it looks like the fan doesn't have a clutch. Looks like the fan is direct drive. Are you sure that the sound is the fan hitting the shroud?
Keith
Edited by ARKAR on 04-30-12 09:46 AM. Reason for edit: No reason given.
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ARKAR
Contributor
Posts: 580
Loc: Arkansas
Reg: 01-26-09
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04-30-12 09:49 AM - Post#2220664
In response to ARKAR
One more thing, if you are SURE that the fan is hitting the clutch, it could be you have a broken motor mount. Even if they are new, one might still be broken and that lets the motor move enough to get the blade into the shroud. Might want to check them.
I wish I had problems like this! I just wish I could even DRIVE my car! I'm a long ways from driving mine, lots of work to do. I'm so jealous of all you guys...
ARKAR
Edited by ARKAR on 04-30-12 09:52 AM. Reason for edit: No reason given.
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kingkreeton
Contributor
Posts: 459
Loc: Wilmington NC
Reg: 04-15-11
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04-30-12 11:22 AM - Post#2220686
In response to ARKAR
Ya, sorry, I messed that up. I got it confused with one of my other cars that does have a clutch on the fan. 
I'll take a picture of the trans mount and post it. As you can see from the pictures, the fan is not center. Do you think a slightly smaller diameter fan would cause any cooling issues?
I think ovaling the holes out a little will certainly give me the clearence I need. I'll probably roll with that. 
Shane
64 Impala SS: 350 4 speed |
Edited by kingkreeton on 04-30-12 11:24 AM. Reason for edit: No reason given.
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models916
Frequent Contributor
Posts: 1879
Age: 62
Loc: Addison, IL
Reg: 05-28-10
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05-01-12 06:01 AM - Post#2221040
In response to kingkreeton
You can loosen the bolts for the core support to the frame and shift that around a little also. Have to loosen the fenders where they bolt to the support.
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kingkreeton
Contributor
Posts: 459
Loc: Wilmington NC
Reg: 04-15-11
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05-01-12 06:31 AM - Post#2221048
In response to models916
Great tip, thanks.
Shane
64 Impala SS: 350 4 speed |
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turbo38s10
"3rd Year" Gold Supporting Member
Posts: 656
Loc: Agawam,MA
Reg: 09-17-09
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05-01-12 01:02 PM - Post#2221177
In response to kingkreeton
I just looked at my shroud which is out of the car and there is a big difference in the mounting hole location depending on which end you put up and down. Unbolt the shround and pull it back and rotate it 180 degrees. Should fix you problem. Just becareful not to hit the radiator core and punchure it.
Edited by turbo38s10 on 05-01-12 01:02 PM. Reason for edit: No reason given.
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ARKAR
Contributor
Posts: 580
Loc: Arkansas
Reg: 01-26-09
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05-01-12 02:52 PM - Post#2221226
In response to turbo38s10
I just looked at my shroud which is out of the car and there is a big difference in the mounting hole location depending on which end you put up and down. Unbolt the shround and pull it back and rotate it 180 degrees. Should fix you problem. Just becareful not to hit the radiator core and punchure it.
Turbo, are you referring to a '64 you have? If you are referencing the '61 in you avatar picture then it's different. The '64 uses a different bolt pattern on the shroud. I think the pattern stayed the same from '58 til '63 but changed in '64. I was going to use the '63 shroud in the picture I posted above until I noticed they were different.
Keith
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kingkreeton
Contributor
Posts: 459
Loc: Wilmington NC
Reg: 04-15-11
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05-01-12 03:37 PM - Post#2221240
In response to ARKAR
I flipped it 180 and still hits. I looked at the transmission mount and it is using the bottom holes. I have a 4 speed manual. Is that correct? If I move it up to the top holes, won't that bring the front of the engine down?
Shane
64 Impala SS: 350 4 speed |
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turbo38s10
"3rd Year" Gold Supporting Member
Posts: 656
Loc: Agawam,MA
Reg: 09-17-09
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05-01-12 05:02 PM - Post#2221267
In response to ARKAR
Sorry mine is a 61, thought they were the same.
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Joker63
Forum Newbie
Posts: 43
Loc: Memphis TN
Reg: 11-28-07
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05-01-12 05:11 PM - Post#2221271
In response to kingkreeton
Just a suggestion how about adding some shims under the radiator suuport to bring it up
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