Question about Cars & Trucks
All of the problems you mentioned will be there when warm. bearing noise gets worse as the oil thins out and the oil pressure will be lower than normal. Collapsed lifter will indicate with a problem misfiring and will be there all the time. Piston slap will be more evident at lower than required idle rpms. Some knocks can be from loose valve seat inserts but then again that will show up as an occasional misfire and will progressively get worse. Check that the oil filter you are using has a non-return valve built into it to retain oil in the top end when stationary. The knock may be until oil pressure is built up. El cheapo filters mostly do not have the valve. check the viscosity of the oil you are using as you may have to go up a grade.
use a mechanics stethoscope to pinpoint where the noise is coming from. Some failing bearings (idler,water pump,alternator etc) will knock for a while until they warm up
Posted on Nov 14, 2014
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Posted on Jan 02, 2017
SOURCE: experiencing a
it may need a lifter or valve adjustment when cold they will tick or knock depending on how loose or worn out then when it warms up they swell with heast and noise stops. after adjusting or replacing it will stop making noise
Posted on Oct 26, 2009
Most of the vortecs that i have worked on have hydraulic roller lifters, but i cant say for certain that your engine does, however i am sure that it has hydraulic lifters and they can be checked by trying to push them down in the center where the pushrods contact, if they compress easily the lifter is bad, If they are roller lifters, check for any wear on the roller and how well they turn, it is ok to have some side to side movement on the pin but any up/down movement on the roller is bad. If the are non-roller lifters check for wear, if the lifter looks "dished" or "concaved" rather than having flat surface replace the lifter.
Posted on Jan 23, 2010
The knock is likely a worn connecting rod bearing. Are you using the correct weight of oil, never use any heavier than 10W30W, heavy oil viscosity's cause slow circulation through the oil passages and starve the engine's bearings for oil.
Posted on May 17, 2012
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