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hemimstrmax, ASE Certified Technician
Category: Car
Satisfied Customers: 219
Experience:  10 yrs exp. ASE certified, gold certified with all Dodge,Chry ,Jeep, Corporation training
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1987 isuzu: 000 miles..rebuild..noise from front end of motor..revved

Customer Question

i have a 1987 isuzu pup 1.9l motor with about 30,000 miles on major rebuild (local carquest shop). ratteling noise from front end of motor when its warm and revved up a bit. motor runs fine. noise goes away if you shut the motor off. rev it up and it starts making the noise again i pulled the valve cover to look at the timing chain and it looks ok to me. there is a small pin sticking out the tensioner shaft that i couldnt move. i dont know if that is normal. all the valve springs look ok. some of the rocker ( tappets)shaft nuts were loose and i tightened them up but it made no difference. i also loosened the altenator and air pump so they were not spinning as well the water pump and still made the noise. i can't find anything obvious. any advice would be appreciated
Submitted: 8 years ago.
Category: Car
Expert:  hemimstrmax replied 8 years ago.
hi and welcome to ja, it deffinately sounds like a loose timing chaiin, the tentioner is prob worn and not keeping proper tention
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Customer: replied 8 years ago.
so whats the test to diagnos a worn tentioner and chain. it looks and feels tight. i tried running the motor without the valve cover on. what a mess.