C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

what is this stuff on my oil pump pickup screen???

 
Old 04-15-2019, 06:58 PM
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VikingTrad3r
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Default what is this stuff on my oil pump pickup screen???




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Old 04-15-2019, 07:00 PM
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Excessive gasket sealant?
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Old 04-15-2019, 07:08 PM
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its sludge. i can squish it btwn fingers
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Old 04-15-2019, 07:27 PM
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Default used carb cleaner and air to get it out



Those silver flex are actually pieces of valve cover paint.
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Old 04-15-2019, 08:35 PM
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i have a thread on this car where it ran really HOT and i think it had been for quite a while. it does not appear to have affected any metrics on the engine but wow i see the effects here. the engine just has a burnt tinge to it.

when i compare to a low mile 85 that i did, this just appears burnt.

i wasnt the first guy to do the oil pan, and the reason it was leaking is because of the corrossion at the fromt seal that bubba did not take car of. he simple put the grey rubber engintech gasket overtop of it.

so off i go to get myself some scotch pads. i will wear the corrosion down and use either hylomar or a light rtv skim to instal the new engine tech set i bought.



i wipeed the bottom of that splash tray off with carb cleaner. making it look burnt but it was more covered in a real light skim of sludgy smelling oil.

engine tech





all cleaned up and backblowed.
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Old 04-15-2019, 10:19 PM
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Someone didnt keep up on thier oil changes. Ck bearings go from there
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Old 04-15-2019, 10:39 PM
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Originally Posted by cuisinartvette View Post
Someone didnt keep up on thier oil changes. Ck bearings go from there
What he ^^ said :-)
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Old 04-15-2019, 10:56 PM
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Originally Posted by cuisinartvette View Post
Someone didnt keep up on thier oil changes. Ck bearings go from there
i am getting this car to the road track on may 11. hopefully it doesnít grenade. oil pressure is still fine for now.

yeah this car was a basketcase. absolute basketcase.

when i did the first oilchange it realllly stunk. ive never smelled oil like that. i went through 4 or 5 oil changes with high detergent oil and it is better now other than these chunks.

do the bearings go because chunks block the oil passages in the bearing caps or because the pump just cant get the oil it needs when chunks block the intake like this?
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Old 04-15-2019, 11:26 PM
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That pump is shot
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Old 04-16-2019, 01:44 AM
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Im happy to replace it.

can u help me understand why?
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Old 04-16-2019, 05:37 AM
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There is a lot of wear in that pump, you can tell by the scoring/wear marks on the cover where the gears have been spinning, be no surprise to find other areas such as the camshaft, big end and main bearings etc have suffered also. I would be removing some bearing caps to see what state they are in JMPO.
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Old 04-16-2019, 09:20 AM
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ok. i would have to do it from under the car. which i dont mind doing but i guess the question is what i am i going to do about it?

scuff and new bearing caps? ive never done anything like that but i could handle it. replace with stock size?

and add new replacement pump?
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Old 04-16-2019, 09:28 AM
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You can do bearings in the car, rods and mains. Measure or look at the backs for sizing. Are the journals ok?

The pics look bad, but how does the pump cover feel? Are those score marks, or is it just really unfortunate looking polishing? Is it flat? If you put a straight edge on it, is it scored?
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Old 04-16-2019, 09:30 AM
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one sec. i will go measire and photo. run fingernail across markings type stuff?

im more than will to put new caps on as i was planning on this car making it through at least a few sessions of hpde on a road track.
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Old 04-16-2019, 09:42 AM
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so i can feel it with my fingernail yeah. but i cant say there is much actual grooving.thoughts pls.






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Old 04-16-2019, 10:32 AM
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You should probably just replace it and check bearings..

People here will blanch at this, I know.. But if you wanted to, the old timers used to blueprint oil pumps by flat lapping them into spec.. Gears and housing.

There is a specification for oil pump clearance. Or, at least there used to be.
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Old 04-16-2019, 10:43 AM
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confab i did my head gasket on an 85 by decking by getting a scrap piece granite countertop and gluing sand paper to it and sanding them back and forth for 10min. worked perfectly and i was done in a couple hours.

i googled it and im going to do the same thing here just to smooth it out a tad.

furthermore, im going to use hylomar between the plate and the block as a gasket.

im not checking the bearings. oilpressure on the car is perfectly fine, 20-30 when reeaallyy hot at idle with 5w30.

This engine had the unfortunate experience of being massively heatsoaked for a pretty long period of time id say. when i picked up the Skunk (stripe down the middle) its cat was clogged and it took me a while to figure it out and the oil was commonly 270f

my guess is previous owners were not running mobil1 synthetic!!!

anyway ive cleaned it up and im absolutely impressed with the sbc resilience!
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Old 04-16-2019, 11:50 AM
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Originally Posted by VikingTrad3r View Post
absolutely impressed with the sbc resilience!
old saying from way back in the day: "Chevy's start to run best just before they blow up" (because they're getting nice and loose)
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Old 04-16-2019, 12:09 PM
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fair enough and oh well. i paid $650 for the car, any excuse for an ls swap. lets see how far she makes it.


So i did 200 strokes on the 180 grit. can hardly feel it with my finger anymore. in it goes at 100inch lbs. i honestly dont forsee a priblem for daily driver status. on the track....well its a high mileage unit.





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Old 04-16-2019, 03:28 PM
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Your call but I would like to have seen how much bearing material is left on the mains and big end bearings before you button it up, replacing the bearings at this point if the crank is not too bad could extend the life of the engine considerably. From what you have found so far I would say the PO was "allergic" to doing oil changes! Reminds me of an ex sister in law who proclaimed that the car she had at the time went better when the little red light on the dash was flashing (OP light, oil not showing on the dipstick).
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