I have a 2.3l 4dz1 isuzu i replace the head on i experience replacing cylinder heads and ive been satisfied with my end result no issues until this 4dz1. Ist belt on step by step from isuzu instructional videos got her all back together timed ready to drive,everything was good on my test drive until belt slipped. Tensioner was bad so i replaced it and the belt, fired her up 1 crank n shes sound good, off i go for my test run everything sounded good until my way back she died and it sounded like the belt slipped again pullled the covers off this time the belt is fine but TDC and cam lines r way off!! Anybody's info on what my issue is n how i can fix it will b greatly appreciated!! Thanks , Helpmy91
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Timing belt under tensioned - - Foreign material causing belt to jump time - - Canshaft seizing to cylinder head due to lack of lubrication - or lack of lubrication at some point in time.
Cylinder head galling or scouring at camshaft ‘bearing’ surfaces and aluminum material transferred to the camshaft is indicative of poor lubrication, that has occurred at some point .. This can cause the camshaft to lock after engine is operated and reaches operating temperature resulting in timing belt jumping .. then after engine cools - camshaft seems to rotate normally -
IF everything else checks out ok - recommend camshaft bearing caps be removed and inspected for ‘any sign’ of galling / scouring .. IF this turns out to be the case - cylinder head replacement will be required.
Good luck with it!
Cylinder head galling or scouring at camshaft ‘bearing’ surfaces and aluminum material transferred to the camshaft is indicative of poor lubrication, that has occurred at some point .. This can cause the camshaft to lock after engine is operated and reaches operating temperature resulting in timing belt jumping .. then after engine cools - camshaft seems to rotate normally - IF everything else checks out ok - recommend camshaft bearing caps be removed and inspected for ‘any sign’ of galling / scouring .. IF this turns out to be the case - cylinder head replacement will be required. Good luck with it!
Cylinder head is brand new would though thats why im so confused? Thank u for tour replys i appreciate every thing
Was wondering if a turn signal switch diagram was out there i sure could use one for my 91 isuzu pickup thanks