The ticking might be injectors. I've heard ticking in mine since I started it at
the dealer. (June 1992) I asked about it and it was checked. It was injectors.
When I got it home I double checked it with the old hose trick and it was the
injectors. It's hasn't changed in 108k miles.
Doug Fedeli
Mike and Del wrote:
> hello all. I'm working on a 94, 3.9. with 280,k on it. Both heads cracked
> in two places, all between the valves. Over the years I've replaced, lifters
> [rollers] rockers, pushing rods, but the ticking is still there. Did the cam
> chain twice last one with tentioner. Replaced belt idler also. I hope the
> dreaded ticking will stop with the rebuilt heads but would like to explore
> all other possiblitys.
> This ticking is a little odd though, it is louder on a cold morning
> sometimes. It's louder under load but still heard with the engine floating
> [no load] seems to cycle on off slightly during prolonged highway use at
> 70mph. thought it was a lifter untill changed parts.
> Now I find myself staring at the lifter retainer plates and the springy
> sheet metal thingy that holds them down. These plates are numbered 1,2,3. no
> left or right , there are 6 of them natch.
> two seem shinny in the area where the lifter would ride on them. these odd
> little plates are able to move front to back 1/8"
> nubbish bumps conntact the springy clamps arms which apply 15 lb.s or so of
> clamping when bolted to block in lifter vally.
> is it likely or possible that the ......ticking is one of these plates
> hopping around? And is any of this hardware replaced on a usual basis?
> Thanks M. Ryder
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