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Pontiac Engine Valley Pan


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5 replies to this topic

#1 phonetek

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Posted 04 July 2011 - 09:47 AM

This is a circuital part of a healthy Pontiac engine and very neglected. Until discussing this in FBN chat I had no idea how important a clean valley pan was. Knowing that now it is certainly worth sharing. I don't mean just on the outside either. They are great collectors for grit, grime, leaves, cobwebs dropped nuts and bolts, even tools and a wide variety of many other things. None of that is good for it either but even more is the inside of it. Like probably most typical guys going through my engine I was merely going to clean the debris and gunk off the outside, scrape off the gasket material and replace the grommets and throw it back on.

From what I learned the proper thing to do is to drill out the spot welds and crack it open and give it a complete cleaning. Hot tanking in one piece it isn't good enough because you can't get all of the years of gunk out. That works as well as using compressed air on an air filter. Not a good idea. The valley pan helps your engine breath and it also helps the engine stay cooler. Once you get the inside cleaned back up then you weld it back together. Anything worth doing is worth doing right. Unfortunately I only have before and after photo's at the moment. I did photo the process but those will get added a bit later as I used my wife's phone and she of course has it with her. LOL Hope this helps

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#2 mgr52

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Posted 11 August 2011 - 08:29 PM

man that looks great now!

What cleaning process would you recommend if you don't have access to welding equipment?

How did you paint it and what kind did you use?

#3 72 blackbird

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Posted 11 August 2011 - 08:58 PM

I've always been an advocate of splitting valley pans after having a good rebuild fail for no other foreseeable reason. After examination of the failed engine, I disassembled the engine and it occurred to me the dirt which caused the bearings to fail came from the valley pan, despite being hot tanked, since all other parts were cleaned thoroughly. I split the valley pan in question and still found trapped dirt particles that the hot tanking process probably loosened- good reason to forget about the idea that hot-tanking alone will clean a used valley pan 100%.

Hot tanking will clean the exterior of the valley pan, but where the two halves of the pan are spot-welded will tend to still hold dirt particles- the only way to clean the pan 100% is to split it, and then reweld it after cleaning. Blasting the interior of a valley pan should also be avoided as the blast media can imbed itself in the pores of the metal- use a wire wheel to thoroughly clean both surfaces inside the pan, and underneath the pan.

Geno

#4 kdog88

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Posted 16 August 2011 - 06:33 PM

Hi,
Nice Job, just did my 80 Indy the same way.
Where did or can you find the PCV Grommet
with the small hole, I can't find one.
Thanks

#5 kdog88

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Posted 16 August 2011 - 06:45 PM

Hi Again,
Just read your profile, I have the same car. Just pulled
the motor and trans., new gaskets, seals, paint etc.. I
am trying to locate where to put 2 heat shield's, posted
problem on tech. forum. Any help would be appreciated.
Thanks,
Kevin

#6 Cheats

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Posted 20 August 2011 - 02:15 PM

Thanks for the heads up on this. Great tip.






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