Just developed a harsh rattle on 87 560sel just after changing starter, which I do not think has anything to do with it,

probably timing chain, 243000, never changed as far as I know.

Compression 150-165 all aroud but does have a miss as idle.

?? Would I have this compression if the chain "jumped' and bent a valve??

Thanks

John

If you had a bent valve that was causing a miss you would be low on compression on that cylinder, I believe. Those numbers do not look at all low to me.

Tom W

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

Change the timing chain, tensioner and guide rail irght away, it is waaaaay past due, you are running on borrowed time

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1991 560 SEC AMG, 199k <---- 300 hp 10:1 ECE euro HV ...

1995 E 420, 170k "The Red Plum" (sold)

2015 BMW 535i xdrive awd Stage 1 DINAN, 6k, <----364 hp

1967 Mercury Cougar, 49k

2013 Jaguar XF, 20k <----340 hp Supercharged, All Wheel Drive (sold)