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#1
11-14-2007, 10:36 PM
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Lifter or Wrist pin
Will a w124 engine miss if a lifter collapses and if there is no miss, could it be a bad wrist pin?
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#2
11-15-2007, 06:09 AM
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a loose wrist pin would make noise under decelleration, i think, and would not make it miss unless very very loose, and then it might actually hit something like a valve.
if the valve adjuster collapsed completely it might miss, if it were off enough. i don't know the answer, but theoretcially it might. 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.
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#3
11-15-2007, 06:10 AM
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a loose wrist pin would make noise under decelleration, i think, and would not make it miss unless very very loose, and then it might actually hit something like a valve. the wrist pin if that is it can tick with little or no ill effect on a motor for many miles, i seem to remember. a wrist pin seems unlikely on the robust benz lower end.
if the valve adjuster collapsed completely it might miss, if it were off enough. i don't know the answer, but theoretcially it might. tom w
__________________
[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.
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#4
11-15-2007, 11:20 AM
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Generally speaking - don't know why a Merc would be different. Wrist pin = tick, at least until it gets very close to going and should get louder under load or when backing off. A lifter will just hammer, scare the hell out of you, and may seem like it's missing.
If you oil is old, I'd first pour in and additive to see if the lifter frees up, and then switch to syn.
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89 300E 79 240D 72 Westy 63 Bug sunroof 85 Jeep CJ7 86 Chevy 6.2l diesel PU "The object of life is not to be on the side of the majority, but to escape finding oneself in the ranks of the insane." Marcus Aurelius
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