What is loud irregular clatter/ rattle on top of passenger side of my engine

20

Asked by selatyp Oct 28, 2016 at 05:11 PM about the 1968 Cadillac DeVille

Question type: Maintenance & Repair

   My 1968 Cadillac make a loud irregular clatter/ rattle atop the passenger side of the engine. Mechanic recently changed all rocker arms and bridges due to ticking. Than car overheated on freeway. Mechanic put in thermostat (there was none) changed oil which had turned black and sludge like, refilled antifreeze. Now loud irregular clatter/rattle.  Please HELP!
                                                                         Being Taken For a Ride in MY Cadillac      

3 Answers

F_O_R answered 8 years ago

The sludge may have plugged up the hydraulic lifters.

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selatyp answered 8 years ago

Hi Mark helpful and Jim, Thank you for your responses, but Jim what about the present clatter? Did the mechanic who changed the rocker arm assembly not tighten something properly?. I am reluctant to return to him for several reasons. He seems to not really know what he is doing, but he would never admit it. He is arrogant . Thank you

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selatyp answered 8 years ago

Jim, it is my undertstanding that the valves have been hardened for use of non-leaded gas. I have asked my new mechanic to check for improper installation of rocker arms, damaged lifters and other causes. Thank You very much! selaatyp

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