86 hardbody 4x4

[privateer]

I just got an 86 hardbody 4x4 z24, after 20 yrs with a 620 l20b!! this is kinda diffrent for me,, so can you guys get me up to speed on this z24?? and it's 'electro injection'??? makes a lot of valve type noises adjusted them all but not much diffrence, no cam or other valve wear detectale, seems clean inside, am i hearing something else?? just above idle and up to about 2500rpm mostly,no missing or other barks or howls over 120k tho.:unsure:

[Sealik]

120K????

That's a pretty fresh engine... ;) ... :D

Could be the timing chain you are hearing.

Check for chain stretch.

[MicroMachinery]

Also check the alternator bolts(bottom ones). They'll make a rattle if they're coming loose.

 

There are alot of pieces that will make suspicious noises if they're not fastened down, so do some searching around.

[darrel]

Try to narrow it down using a stethoscope or a piece of rubber hose. Not familiar with the electro injection, could it be injectors? Another thought would have to be the exhaust manifold, loose or broken studs holding it on.

[datzenmike]

Check and set the valve lash while the engine is hot.

[privateer]

OK checked all the bolts, and i had set the valves to .012 when it was hot per the hood sticker,was wondering if it was an injector pump,no injectors as it has throttle body injection

how can i check the timing chain? i know the earlier models had the tensioner by oil pressure, and it sounds most like the chain i think!!

 

 

[greybeard]

The Timing chain set is just like an L series with the tensioner in the same place. guides are a little different, once you see it you'll know what to do.

[HRH]

Z24 electro injection uses two dribblers, just like a Chevy TBI. 104 hp when new, 8.6:1 compression. Gutless they are, but quite reliable and make good torque.

 

Check valve lash and chain stretch as suggested above.