Timing Covers

[Minuit]

My 4.0's timing cover is all chowdered up and I'm not spending the money or time on a crappy aftermarket one. Does anyone know what years will interchange with a '91? Would I be alright with just grabbing one from the newest Jeep I can find at the junkyard? Can't find much about this online.

[sinkrun]

I think there different on the newer motors maybe 95 up?

[HOrnbrod]

I've looked at this before. The 91-00 covers will interchange, but there are differences. The earlier ones (before ~ 95-96) had the timing marks and boss. The later covers, after 96 I think, did not, but will interchange if you don't care about the timing marks. I like to have them as I slap a timing light on once in awhile just to check the advance and how steady it is. And according to the parts manuals, the 01-02 covers do not interchange with the older covers. Why I don't know.  :dunno:

 

Logic says the 4.0 covers should all interchange, since the harmonic balancers and timing chains did.

[Minuit]

Alright, thanks guys. I don't use a timing light much but I'd feel uneasy if something that's supposed to be there was missing. Silly me thinking that was one of those "1964-2006 interchange" parts.

[Minuit]

Ran by the pick and pull and got a timing cover out of a '95 (with 318,000 miles!) today. It has the timing marks and looks to be 100% exactly the same as my old one. What was the original finish on these? Were they painted or bare aluminum? The donor part is so dirty it's impossible to tell what it looked like 20 years ago.