help! what is this part on my timing cover? - JeepForum.com
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post #1 of 15 Old 07-21-2020, 06:27 PM Thread Starter
rdodger
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help! what is this part on my timing cover?

Help. my timing belt is rubbing on this cylinder-shaped thing sticking off the timing cover. Can i grind it off? WHat is that?

COntext: I just replaced my 1999 wrangler engine with a 4.0 from a 93 grand cherokee. Didn't realize the timing cover was different until i went to put the belt on. Here's a picture of a timing cover from the internet. it should illustrate the cylinder part (by the timing marks) i mean.

I'd rather avoid messing with a working engine until i have it running again (at least). please advise. the easiest solution would be to grind some material off, to create clearance for the belt, so im hoping its like a "large mole" on my engine, and not important.

pic:

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post #2 of 15 Old 07-21-2020, 06:27 PM Thread Starter
rdodger
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https://www.quadratec.com/sites/defa...ages/30838.jpg

here's that pic i was trying to post
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post #3 of 15 Old 07-21-2020, 08:46 PM
Dale M.
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IT may be for a locking pin to index the crankshaft/pulley to setup timing and valve train....

Dale

“Fear The Government That Wants To Take Your Guns" - Thomas Jefferson.
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post #4 of 15 Old 07-23-2020, 01:17 PM
BlackSheepCJ
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Is the entire engine put together? If it is and it's not being used I would grind just enough. Otherwise, you're best bet is to wait until it's put together and ready to fire up before deciding.

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post #5 of 15 Old 07-23-2020, 01:29 PM
BlackSheepCJ
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So I checked to see what that piece is by entering '93 Grand Cherokee with 4L I6 as the vehicle info and 4WD has a different looking timing cover. It's similar to yours, but doesn't have the nub that you're asking about. To me it seems like most of the pics I find for a '93 timing cover don't have that nub so it could very well be something that was on there initially, then was changed due to belt fitment issues. Here's the link to the one that 4WD lists https://www.4wheelparts.com/p/crown-...ng-covers/4701
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post #6 of 15 Old 07-24-2020, 02:29 AM
Jonny Jeep
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It's an earlier, pre-TJ cover. I've looked in earlier FSMs (88 XJ/93 ZJ) which both show the timing cover looking like that, but, I see no use for in the FSMs.
It's obviously unimportant so go right ahead and saw/grind it off.
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post #7 of 15 Old 08-08-2020, 02:45 PM Thread Starter
rdodger
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success, i think.
I DID file off the knobby thing, and it has clearance now. i didn't break into a chamber of any kind, so i'm hoping its ok.
I still haven't figured out my electricals and got it started, so i wont be confident in this 'repair' until i do . thanks for the advice
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post #8 of 15 Old 08-08-2020, 04:04 PM
4Low2G0
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FYI the 4.0 does not have a timing belt...... just sayin'

That nub was for a probe that the old engine tune up scopes used to pick up timing
before they picked it up from the computer. before OBD1



Bet some of you kids have never even seen one. let alone used one. LOL

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Whats over that next ridge?
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post #9 of 15 Old 08-08-2020, 04:29 PM
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I am NOT alone, there are others, how about a point file and a dwell gauge - Anyone.

That SUN machine and much more is now in all vehicles - OBDII.
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When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #10 of 15 Old 08-08-2020, 04:39 PM
4Low2G0
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Quote:
Originally Posted by jtec View Post
I am NOT alone, there are others, how about a point file and a dwell gauge - Anyone.

That SUN machine and much more is now in all vehicles - OBDII.
LOL Yes I have those, and Ignition wrenches and more stuff you need working on vintage stuff.

Anybody know what this is?
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Whats over that next ridge?
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post #11 of 15 Old 08-08-2020, 05:25 PM
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Quote:
Originally Posted by 4Low2G0 View Post
LOL Yes I have those, and Ignition wrenches and more stuff you need working on vintage stuff.

Anybody know what this is?
Yep, even know that sometimes you need to make an adapter out of a frozen orange juice concentrate tube to use it.
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post #12 of 15 Old 08-08-2020, 08:21 PM
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Quote:
Originally Posted by 4Low2G0 View Post
FYI the 4.0 does not have a timing belt...... just sayin'

That nub was for a probe that the old engine tune up scopes used to pick up timing
before they picked it up from the computer. before OBD1


Bet some of you kids have never even seen one. let alone used one. LOL

Like This,
I bet some old Snap-On guy is looking for the mechanic that still owes on that machine from.50 years ago

Semper-Fi "81-84"
I.U.O.E. - 18
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post #13 of 15 Old 08-08-2020, 09:59 PM
jtec
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4Low2G0 ok that is not drawing any memories....

I will bite what is it ?

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #14 of 15 Old 08-08-2020, 10:08 PM
4Low2G0
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Quote:
Originally Posted by jtec View Post
4Low2G0 ok that is not drawing any memories....

I will bite what is it ?
Kind of a trick question here on the Jeep forum.....

Its a Unisyn, measures air flow, it's used on multi carb engines to measure air flow thru each carb
so they can be synchronized. first step in tuning multi carbs, mostly a foreign sports car thing.

Whats over that next ridge?
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post #15 of 15 Old 08-09-2020, 12:12 AM
jtec
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OK our trip down memory lane-
multi carbs - in my day the crowd considered a mopar 6 pack as a hard to tune combo, Ca Ching

thanks for the memories

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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