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Username Post: 4.3 L intake gasket replacement        (Topic#183246)
gchemist 
Senior Chevytalk Moderator
Posts: 24271
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
02-26-08 07:46 PM - Post#1375505    

I started the intake gasket replacement today. I'll do a write up at the end. I moved more stuff than necessary however the intake was easier to remove. The intake was very loose. The gasket was broken in several places. The driverside gasket was bad. Water was up and down the entire line. Look at the pictures for details.

The entire system will be flushed for conversion to green antifreeze. The Dex-cool radiator looked like it had mud in it.

The fun begins tomorrow! Clean up and install.







(The following link provided by jpsage.
Additional info at http://www.handymanlyness.com/archives/auto/repair...

The above article goes about removing several parts. I didn't remove all the parts listed. Especially the A/C compressor. I just moved it forward and bolted down with the rear bolts temporarily.

'95 Jimmy SLT (Bought @131,814)
'83 Silverardo XST - ZZ4 powered
'96 GMC Jimmy LS Ret. @236651 miles


Edited by gchemist on 02-16-11 12:01 PM. Reason for edit: No reason given.

 
SleeperSS 
Senior Member
Posts: 2549

Loc: Spanaway, Wa
Reg: 10-17-04
02-26-08 10:29 PM - Post#1375635    
    In response to gchemist

When you replace the manifold, get a couple of studs for the heads to locate the manifold so that the sealant on the ends don't get mushed around.

U.S.C.G. "So others may live"

'96 S-10 SS
'02 BlaZeR2





 
malibu101 
Very Senior Member
Posts: 1756

Age: 51
Loc: Walnutport PA
Reg: 11-20-00
02-29-08 09:54 AM - Post#1377380    
    In response to SleeperSS

I just saw this thread after the other one about removing the thing one the throttle plate.
I see a heater core. Smart idea to replace it but you'd better learn a few new swear words when you find out that the dash has to come out to access it.



 
gchemist 
Senior Chevytalk Moderator
Posts: 24271
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
03-02-08 06:33 AM - Post#1378538    
    In response to malibu101

I found evidence the core had been previously replaced. Screws were missing from some lower panels. I left the core alone. I hooked up the hoses and flushed with water. I wanted to get out all Dex stuff before converting to green coolant. The flush did get rid of the dreaded gargaling noise common with these cores. The new radiator works great. The engine is running a lot cooler. I'll post the final install pictures later this week. I even modified the thermostat too.

The transmission likes the external cooler. It shifts differently. No leaks so far oil, tranny oil or water!!

'95 Jimmy SLT (Bought @131,814)
'83 Silverardo XST - ZZ4 powered
'96 GMC Jimmy LS Ret. @236651 miles


Edited by gchemist on 03-02-08 06:34 AM. Reason for edit: No reason given.

 
daveh 
Member
Posts: 15

Reg: 01-28-05
03-02-08 12:35 PM - Post#1378780    
    In response to gchemist

I am in the middle of the intake gasket swap on my 2001 Jimmy right now. I have found a couple of references to a final torque of 11 ft-lbs and to use some loctite on the bolts. The only thing I haven't found is the correct torque pattern for the 8 bolts. Anyone know this?

Dave
Rodney, MI



 
gchemist 
Senior Chevytalk Moderator
Posts: 24271
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
03-02-08 06:00 PM - Post#1378958    
    In response to daveh

My service manual has the pattern. I can post the sequence tomorrow. I let mine sit for at least 12 hours for the intake silicon seals to cure. No problems after driving around 3 days.

'95 Jimmy SLT (Bought @131,814)
'83 Silverardo XST - ZZ4 powered
'96 GMC Jimmy LS Ret. @236651 miles


 
gchemist 
Senior Chevytalk Moderator
Posts: 24271
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
08-23-08 05:57 PM - Post#1506290    
    In response to gchemist

Making topic a sticky

'95 Jimmy SLT (Bought @131,814)
'83 Silverardo XST - ZZ4 powered
'96 GMC Jimmy LS Ret. @236651 miles


 
dugman67 
Member
Posts: 41
dugman67
Loc: Kentucky
Reg: 01-11-04
01-15-09 02:17 PM - Post#1607752    
    In response to gchemist

My turn...my turn.... I just noticed the front seal of the intake leaking antifreeze. Yes i still have the dex crap in it I'm just debating to do it myself in 20 degree weather (no garage) or pay to have it done Do you have to replace the lower or just the upper gaskets? I checked the prices and they better not leak at those prices. I need an older car or truck to play with. But that's another story. If I do it myself, any tips?




 
83_Burbin 
Member
Posts: 196

Age: 63
Loc: Neenah, Wisconsin
Reg: 04-28-03
04-23-09 05:20 PM - Post#1683545    
    In response to dugman67

Gchemist, how hard was "Burping" your system ? I found when changing my water pump, it took getting pretty hot to get it flowing ... runs a little warm at first am run but, fine once the t'stat opens ... Q ... is this a sign of time to replace ? I did pump, lower hose, belt and idler pulley. Did the wrong one, ... still have the squeak , have to do AC idler now. Mine already had the green put in it ... got lucky there (maybe '95 had green, I dunno).

Old Chevies Never Die, They Just Rust Away .... used to believe this to be true but ... my S-10 died while rusting away!

'97 Buick LeSabre Custom
'01 Coleman Santa Fe


 
gchemist 
Senior Chevytalk Moderator
Posts: 24271
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
04-24-09 04:55 PM - Post#1684320    
    In response to 83_Burbin

Thermostats are not made the same. What brand did you use? After my conversion, I have a problem in actually heating the engine up. Every now and then, I get a coolant not hot enough code. I contribute the code to the two holes I drilled into the thermostat. The holes were drilled to help air get out and for water flow before the thermostat opens. I simply reset the code. No problem since the conversion to the yellow/green stuff.

Park your truck on ramps. Rev it up a little. The angle will help get the air out of the heater core. My gargled until all the air was removed.

'95 Jimmy SLT (Bought @131,814)
'83 Silverardo XST - ZZ4 powered
'96 GMC Jimmy LS Ret. @236651 miles


 
SleeperSS 
Senior Member
Posts: 2549

Loc: Spanaway, Wa
Reg: 10-17-04
04-24-09 07:09 PM - Post#1684429    
    In response to gchemist

The easiest way is to get a Prestone Flush & Fill kit...<$6. I've never had any issues since using this.

U.S.C.G. "So others may live"

'96 S-10 SS
'02 BlaZeR2





 
SleeperSS 
Senior Member
Posts: 2549

Loc: Spanaway, Wa
Reg: 10-17-04
05-27-09 06:28 PM - Post#1705777    
    In response to gchemist

I'm doing my bro-in-laws ZR2 tomorrow and I can't seem to find bolt sequence...do you have it handy???

U.S.C.G. "So others may live"

'96 S-10 SS
'02 BlaZeR2





 
gchemist 
Senior Chevytalk Moderator
Posts: 24271
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
05-27-09 06:35 PM - Post#1705779    
    In response to SleeperSS

Start from the center and go across back and forth.
First pass tighten to 26 inch lbs. (3 Nm)
Second pass tighten to 106 inch lbs. (12 Nm)
Final pass tighten to 11 ft. lbs. (15 Nm)



'95 Jimmy SLT (Bought @131,814)
'83 Silverardo XST - ZZ4 powered
'96 GMC Jimmy LS Ret. @236651 miles


Edited by gchemist on 05-27-09 06:37 PM. Reason for edit: No reason given.

 
SleeperSS 
Senior Member
Posts: 2549

Loc: Spanaway, Wa
Reg: 10-17-04
05-27-09 08:19 PM - Post#1705848    
    In response to gchemist

Cool...thanks

U.S.C.G. "So others may live"

'96 S-10 SS
'02 BlaZeR2





 
48Butch 
Senior Member
Posts: 146

Loc: Renton, WA
Reg: 10-17-01
07-22-09 02:40 PM - Post#1740019    
    In response to gchemist

Hey gchemist -- Hows the write-up coming along? Or is it filed elsewhere?

Butch



 
gchemist 
Senior Chevytalk Moderator
Posts: 24271
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
07-22-09 06:18 PM - Post#1740160    
    In response to 48Butch

Oh, I guess I forgot to write it up. What do you need to ask or know? Several board members have changed out leaking lower intake gaskets. Checkout the other sticky for more information.
http://www.chevytalk.org/fusionbb/showtopic.php?ti...

You can remove the upper intake seperately or as one piece with the lower intake.

'95 Jimmy SLT (Bought @131,814)
'83 Silverardo XST - ZZ4 powered
'96 GMC Jimmy LS Ret. @236651 miles


 
gchemist 
Senior Chevytalk Moderator
Posts: 24271
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
07-27-09 09:56 PM - Post#1743172    
    In response to gchemist

A great writeup on a lower intake gasket replacement is available.
http://d-tips.com/General/Articles/arti cle.aspx?id...

It's a little over kill by remove the fan shroud and pulleys. The A/C compressor can be moved forward and bolted with the rear bolts. The bolt underneath the compressor can be removed with a crow foot wrench. The fuel lines are easier to unscrew using crowfoot wrenches too.

'95 Jimmy SLT (Bought @131,814)
'83 Silverardo XST - ZZ4 powered
'96 GMC Jimmy LS Ret. @236651 miles


 
GMResto327 
Forum Newbie
Posts: 25

Loc: Queens NY
Reg: 01-11-10
01-19-11 08:26 PM - Post#2034461    
    In response to gchemist

My 99 blazer 4.3 intake is also leaking what. Is advantage of converting to green over orange what is also needed to do to convert back to green

Derek
66 caprice 66 chevelle 66 panel 87monte


 
SleeperSS 
Senior Member
Posts: 2549

Loc: Spanaway, Wa
Reg: 10-17-04
01-19-11 08:39 PM - Post#2034470    
    In response to GMResto327

The advantage is that green will not sludge up the system. Get some Prestone Cleaner...not Flush. Run it for 3-6 hours. It can be over several days. Install a Prestone Flush & Fill kit and follow the instructions.

U.S.C.G. "So others may live"

'96 S-10 SS
'02 BlaZeR2





 
popcorn89 
Contributor
Posts: 178

Reg: 12-22-10
02-22-11 09:44 AM - Post#2050288    
    In response to SleeperSS

i know this may be a little off the subject but here a video of them taking the intake manifold

http://www.youtube.com/watch?v=cpWjF1NRfk8&a mp;pla...



 
mouseman4ever 
Forum Newbie
Posts: 33

Age: 68
Loc: Bloomfield, Ia
Reg: 05-02-12
10-23-13 01:17 PM - Post#2393409    
    In response to gchemist

First, let me say this is awesome. Nancy just bought an 02 Blazer 4.3L. had not heat put antifreeze in and solved problem. Just got tires and they quoted $1,272. to replace lower intake gaskets. We will have to do ourselves, My question is will this tutorial cover the 02 v6 or what changes do I have to make. They should be the same motor?????

Let me thank all the people at Chevy Talk for making our lives easier. And, thanking all in advance for answering my question

Curt and Nancy

Now a true Chevy only family. a 70 CST10 and a 2002 Blazer

Experience is the only teacher

1970 CST C10 350/TH350
2002 Blazer
1984 Cavalier 2.0


 
gchemist 
Senior Chevytalk Moderator
Posts: 24271
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
10-23-13 02:27 PM - Post#2393428    
    In response to mouseman4ever

The '02 4.3 is the same. A few external differences but not enough to worry about. Just follow what we did here. If you do the lower intake gaskets, flush the Dexcool out and go with fresh yellow coolant. I like green coolant but it's getting harder to find. You shouldn't worry about the FI spider either. An '02 already has the factory update.

Use crowfoot wrenches for the fuel lines and intake bolt under the air compressor. If you have any problems post them on the board. I did mine over two days taking my time. I taped everthing to ID what I unplugged or moved. After removing the lower and upper intakes for gaskets and FI spider, I can do a whole setup probably in one day.

'95 Jimmy SLT (Bought @131,814)
'83 Silverardo XST - ZZ4 powered
'96 GMC Jimmy LS Ret. @236651 miles


 
mouseman4ever 
Forum Newbie
Posts: 33

Age: 68
Loc: Bloomfield, Ia
Reg: 05-02-12
10-23-13 04:59 PM - Post#2393471    
    In response to gchemist

My only question is - what is a crowsfoot wrench? Is i the wrench for tubular lines?

Curt and Nancy

Experience is the only teacher

1970 CST C10 350/TH350
2002 Blazer
1984 Cavalier 2.0


 
gchemist 
Senior Chevytalk Moderator
Posts: 24271
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
10-23-13 05:43 PM - Post#2393497    
    In response to mouseman4ever

Haha, here ya go. Go down to Harbor Freight and buy a cheap set of wrenches. You need metric sizes. I bought both SAE and metric to keep handy.
http://www.harborfreight.com/7-piece-3-8-eighth-in ...

Take a look the fuel lines. Right past the shrader valve is where the lines go back down to the fuel tank. You'll need crowfoot wrenches to unbolt the assembly from the main lines to the FI spider.

'95 Jimmy SLT (Bought @131,814)
'83 Silverardo XST - ZZ4 powered
'96 GMC Jimmy LS Ret. @236651 miles


 
mouseman4ever 
Forum Newbie
Posts: 33

Age: 68
Loc: Bloomfield, Ia
Reg: 05-02-12
10-23-13 06:08 PM - Post#2393508    
    In response to gchemist

LOL - Now i know what you are talking about never knew they had a name. Will b getting them soon. Then the fun will begin and I will be sure to let everyone know how things turn out.

Again, thanks for all your help

Curt and Nancy

Experience is the only teacher

1970 CST C10 350/TH350
2002 Blazer
1984 Cavalier 2.0


 
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