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Old 04-19-2003, 01:18 AM
Blu 420Sel's Avatar
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Join Date: Feb 2003
Location: Connecticut
Posts: 274
Things to do with the valve covers off...

So I noticed a little puff of blue when I pull out at the bottom of my hill which along with a touch of oil on the passenger side plugs has led me to believe that my valve stem seals need to be replaced. I figured since I'll be in there anyway I aught to put in new cam oilers too.

Are there any other good things to fix since I'll be there? How tough is it to check the valve clearance? Are there any warning signs to keep an eye out for when inspecting the camlobes and bearings?

Any thoughts would be appreciated.

1988 420SEL 170K
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Old 04-19-2003, 10:17 AM
Thomaspin's Avatar
Join Date: Jun 2001
Location: CA
Posts: 531
Tim - Check for chain stretch....

....and for old chain guide rails, especially the inner one on the driver's side. Dark brown color is not good. It breaks and destroys the top end. Chain and rail jobs on my site.
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Old 04-19-2003, 11:14 AM
Blu 420Sel's Avatar
Registered User
Join Date: Feb 2003
Location: Connecticut
Posts: 274
Yeah, when I first got the car I took it to a good indy and had him pull the valve covers to check the chain and rails. He said that the chain had been replaced and was in good condition with 3 degrees of stretch but that the sprockets were starting to look 'pointy' and should be changed. I'm waiting for my next oil change to roll around so I can pull the oil pan and change my oil level sensor which is leaking. I think I should be able to peak up at the crank sprocket to verify its condition but the safe bet seems to be that changing it is the wise thing to do.

I thought in another month or so I would take a 4 day weekend and pull everything off the front. New cam and crank sprockets, guides, rails, chain, tensioner, everything. Based on posts I've read it sounds like its not too tough just lots of grunt work. You better believe I'll be putting up lots of posts then though

I love working on this car!
1988 420SEL 170K
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