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Old 11-18-2003, 07:32 PM
420benz's Avatar
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Need good additive!

I have one niosy lifter [only when cold] and would like to add a cleaner to the oil. Any suggestions?
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Old 11-18-2003, 08:02 PM
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I may stand corrected and please do if I'm wrong, but I was under the impression that the 420/560's had adjustable valve clearances?

If so, have you tried that?
Mike Murrell
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Old 11-18-2003, 08:11 PM
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Probably a bad lifter period. I wouldn't worry about it. There are some additives out there, but the only legitimate co. that comes to mind is "Lucas". I'm not sure if they make a detergent though.

Threre's a million opinions on additives, so no flame intended.

When it's cold and my car has been sitting for a day or so, it will make lifter noise for a few secs. I ran a detergent (name escapes me) and did nothing.

The valves on the M117 aren't adustable.

Also, how many miles? My clatter started at about 90k in near 0-15F temps.
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Old 11-18-2003, 11:06 PM
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The heads were rebuilt last year about 10,000 mi. ago.I do not know how to adjust the valves on this car. I think they installed new spaces???? Car has 176,000 mil,s
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Old 11-19-2003, 12:05 AM
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Have you had the timing chain rails and tensioners checked. At every 100k this should be checked and the rails/tensioners replaced. You don't want the rails to break and cause the chain to jump and cause major damage. Just a thought.
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Old 11-19-2003, 12:44 AM
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if the tapping is continuous then you need to be concerned and open the valve covers now before damage can be done to the cam & rocker arm. if the tapping is left alone it can progress and possibly damage the cam. if it's only on startup then disappears in a few seconds maybe just maybe adding a detergent may work

mechanically if it's only a valve compensating element (ball stud or lifter) then for 30$ you can fix it. plus 5$ for the valve cover gasket. a cam costs about 275$ plus 8 new rocker arms etc:.

if you want to try the detergent route try either Marvel Mystery Oil or Rislone would be what i would add. run it a few miles maybe 50 if the noise does not disappear then it's mechanical and needs to be addressed.

i had this exact thing happen on my 88 last year and i left it tap away and it cost me that cam. all over only 1 ball stud.

good luck craig
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Old 11-19-2003, 12:48 AM
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Join Date: Jul 2002
Location: visalia ca
Posts: 368
if yours is intermittant, then i suggest changing your
oil to mobil 1 15/50.
i have had huge success with this.
my shop uses mobil 1 15/50 almost in every car.
if after changing and the noise returns, then change
again. absolutely works.
but if you have some mileage on your engine, i would
suggest you check you cams and rockers for wear and
make sure that the oiler tube plastic connectors are tight.

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Old 11-19-2003, 12:49 AM
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I agree with Craig. My racket has gone on for too long (first owner?) so I'm sure head work is in order. Not pressing, but surely something to tackle if I want to keep the car.
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Old 11-19-2003, 06:06 PM
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As i stated both heads were rebuilt including new rocker arms, valve guides,seals,chain,rails and tentioner.All lifters were checked at the time and were o.k As soon as i get valve cover gaskets from phil i will try to find out where the noise is comming from. Thanks for all your help.
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