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Username Post: lubrication problems????        (Topic#358016)
vet65b 
"9th Year" Gold Supporting Member
Posts: 612
vet65b
Loc: Albuquerque, NM
Reg: 02-09-06
09-10-19 05:54 PM - Post#2775287    

Guys,
I have a 327 SBC that was professionally built about 15 years ago. Motor is mildly modified 350 HP out of my 1966 Corvette. Cam is a Comp Cam roller hydraulic with less than .500 lift. Rockers are Comp roller tip. Oil pump is a Melling 55 psi, oil pressure with 10W-30 hot is 58 psi. Motor has about 25K trouble free miles on it.
Two months ago I changed oil/filter at 2K miles as usual. Oil used is a well known Pennsylvania base oil. Two weeks later I have noise and blackened rockers with carbonized oil around the pivot ball on right side of motor. With motor idling (30 psi) there is a good supply of oil to all rockers.
My first thought was a blockage in the lifter feed galley, but ALL rockers are oiling fine. Replaced rockers, lubed with break-in lube and drove about 200 miles. Same thing is happening again, black rockers on both banks this time.
What is your best idea for the cause of this? Could is be the low amount of ZDDP in the oil I am using? Any advise apricated! Thanks Bill






 


YOUNG57 
Frequent Contributor
Posts: 1139

Loc: Tennessee
Reg: 12-06-10
09-10-19 08:15 PM - Post#2775300    
    In response to vet65b

Since this occurred after you changed oil and filter you might check and change the oil filter, it could have separated and clogged one of the galleries.

But with good oil pressure the filter shouldn’t be the problem since it is before the oil pressure sensor switch or tap. But it’s worth checking.




 
IgnitionMan 
Valued Contributor
Posts: 3645

Reg: 04-15-05
09-10-19 08:20 PM - Post#2775302    
    In response to vet65b

What brand oil filter, hope it IS NOT a FRAM.

Also sounds like the viscosity is too low, and possibly additives package in oil has changed for the worse.



 
grumpyvette 
Senior Chevytalk Moderator -- Performance Subject Matter Expert --
Posts: 17384
grumpyvette
Age: 71
Loc: FLORIDA USA
Reg: 03-16-01
09-11-19 10:06 AM - Post#2775342    
    In response to IgnitionMan

because the issue started with the oil and filter change Id strongly suggest,
that you take the effort too, verify the dip stick reads correctly,
if the oil levels low its a problem, change both the oil filter and the oil being used,
do it immediately before more damage, potentially occurs.
a WIX filter and VALVOLINE 10w 30 would be a decent choice
whats your oil temperature? it should be lower than about 210f-220f max most of the time
your rocker geometry may be restricting the volume of oil flowing over the rocker ball pivot.
Id also suggest you back off the rocker adjustment nut at idle until the rocker clicks,
then very slowly tighten the rocker adjustment nut just until the clicking stops then add only 1/4 turn of preload,
as that will maximize oil flow to the rockers

http://garage.grumpysperformance.com/index.php?thr...

http://garage.grumpysperformance.com/index.php?thr...

http://garage.grumpysperformance.com/index.php?thr...

http://garage.grumpysperformance.com/index.php?thr...

IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!


Edited by grumpyvette on 09-11-19 11:52 AM. Reason for edit: No reason given.

 
vet65b 
"9th Year" Gold Supporting Member
Posts: 612
vet65b
Loc: Albuquerque, NM
Reg: 02-09-06
09-11-19 12:01 PM - Post#2775346    
    In response to grumpyvette

Guys,
Thanks for the tips, most I have already checked.
Oil filter is 1143 NAPA GOLD, it and the original cannister are good, nothing loose inside. As for oil weight, under my ownership it has always been 10W-30. Dip stick reads correct. It's a street motor with 0.002/0.0025 clearance rods/mains. I am wondering if a lack of ZDDP could cause damage to the rocker balls.
As for oil temp, I have used an IR gun on the pan after a 50 mile run in NM heat. Oil temp is 190* to 195*
Unless you guys come up with something else the current plan is to drain oil/filter, pull rockers and inspect for heat damage, re-assemble with moly-coat EP lube and fill crankcase with racing oil. If you have any other ideas I am ready to try them!Thanks! Bill



 
IgnitionMan 
Valued Contributor
Posts: 3645

Reg: 04-15-05
09-11-19 03:56 PM - Post#2775357    
    In response to vet65b

If you use Moly lube, change the oil and filter again fairly soon after restart. Moly molecules are large enough to plug filter element media.





 
65_Impala 
Very Senior Member
Posts: 4247

Reg: 12-29-02
09-11-19 09:57 PM - Post#2775374    
    In response to vet65b

In the last thread you started you posted that the pushrod tips and springs were blackened and now you posted that the pivot ball area is blackened. Is the issue really in the pivot ball area and not anywhere else?

I could believe oil selection affects the pivot ball, but I'm doubtful it would affect the pushrod tip or valve spring.

If you're buying another rocker set then consider going to full rollers instead of the pivot ball.




 
Mel Foye 
*VIP* Founding Member
Posts: 4849
Mel Foye
Reg: 09-29-00
09-12-19 04:31 AM - Post#2775379    
    In response to vet65b

Along with checking that the push rods are clean on the inside, are they straight?



 


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