Jeep Died Off-road, Cam not spinning - JeepForum.com
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post #1 of 33 Old 01-12-2020, 07:35 PM Thread Starter
mystert29
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Jeep Died Off-road, Cam not spinning

I was out in the desert going a little faster than I should and hit a few bumps a bit hard and broke off my front passenger shock mount at the axle. In addition the Jeep shut off and would fire back up. I have Howell FI and checked the grounds and fuses. The fuel pump turns on and I dumped some gas down there TB and nothing. The HEI wiring was good and I took off the cap and noticed the rotor wasn’t spinning when I turned over the engine. I took the oil fill plug out and noticed the rockers not moving. Pulled the distributor and the cam gear isn’t spinning. I recently replaced the stock timing chain and gears with a Cloyes replacement set. I’m guessing I somehow rattled out of sheared off the pin that locates the timing gear on the cam. Maybe I snapped off the end of the cam? It’s been running great until this. Anyone have this issue before? I’m going to take the timing cover over and take a look this week after work or next weekend. Curious what everyone thinks.

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post #2 of 33 Old 01-12-2020, 08:01 PM
John Strenk
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I did the same thing on another vehicle. Sheared the pin off and it just spun.

I should of checked the cam bearing clearance before I installed it...


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post #3 of 33 Old 01-12-2020, 08:38 PM
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Any chance the bolt wasn't torqued properly (or not loc-tite) and backed off?

Either way, that sucks, as now you're tearing the front off for a little tiny $0.02 worth of steel.... plus the time needed to drill/remove the old pin.

I'd suggest that if there's much wear on the cam 'nose', don't cheap out, replace the cam.

Rick

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post #4 of 33 Old 01-13-2020, 09:51 AM Thread Starter
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Quote:
Originally Posted by Cutlass327 View Post
Any chance the bolt wasn't torqued properly (or not loc-tite) and backed off?

Either way, that sucks, as now you're tearing the front off for a little tiny $0.02 worth of steel.... plus the time needed to drill/remove the old pin.

I'd suggest that if there's much wear on the cam 'nose', don't cheap out, replace the cam.

It was torqued right. What do you mean by cam "nose"? The outside diameter area of the cam that the timing gear slips over? Im hoping its not too bad, I just cranked it a few times after it cut off.

I just looked at the 1984-1986 M.R.252 service manual and there is a section "Camshaft Pin Replacement." It must be a common problem if it has its own how to section. It says that there are two types, a spring and a solid pin. Im going to replace the spring pin with a solid one. Any idea what part number or size it is? Id like to order everything up so I can just take it apart and throw it back together same day and not have to wait on parts.
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post #5 of 33 Old 01-13-2020, 09:59 AM
Cutlass327
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Yeah, the part the cam gear slips on.

If you only cranked a short bit, I doubt you damaged it then.

As for size of pin, I'm not sure

Rick

1978 CJ5 5.0HO/T177/D300, '86 D30/D44 WT axles, 'glass body, 31x10.5 BFG A/T, TDK galv'd frame - DD and weekend toy


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post #6 of 33 Old 01-13-2020, 10:40 AM
John Strenk
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I don't know if you can do it on your cam but after the first incident, I added a second pin.

Just for redundancy.

My problem with the first cam was that the cam bearing clearance was too small and when it heated up, the cam had too much drag added with the taller lift put a lot of stain on that little pin.

But it's just a suggestion, You might not ever have another problem with it.

I always wanted to try some of those offset pins sets where you can adjust the cam timing.


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post #7 of 33 Old 01-14-2020, 10:03 AM Thread Starter
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I cant find the pin size or part number anywhere. Ive googled all sorts of stuff with no avail. Is there a factory parts book online that I just dont know about?
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post #8 of 33 Old 01-14-2020, 11:01 AM
Matt1981CJ7
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The Jeep part number is J045 6384. But my searches came up empty, as well.

Perhaps you can remove the old pin and match it up with one from this page:

https://www.summitracing.com/search?...%20dowel%20pin

Matt


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post #9 of 33 Old 01-16-2020, 07:42 AM
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I have my old original cam in storage, with the gear still on it, and perhaps I could find out what type and size pin is in it. let me know if you still need that info.

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post #10 of 33 Old 01-16-2020, 09:22 AM Thread Starter
mystert29
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Quote:
Originally Posted by keith460 View Post
I have my old original cam in storage, with the gear still on it, and perhaps I could find out what type and size pin is in it. let me know if you still need that info.
If you could get to it easily and measure it that would be awesome . Thanks
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post #11 of 33 Old 01-16-2020, 06:45 PM
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OK, you can head to your local Hardware Store as the pin is nothing special. It's just a Roll Pin or Spring Pin of 1/4"D x 3/4"L.
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IMG_3996.jpg   IMG_3997.jpg   IMG_3999.jpg   OEM Camshaft Roll Pin.jpg  
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post #12 of 33 Old 01-17-2020, 09:33 AM Thread Starter
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Originally Posted by keith460 View Post
OK, you can head to your local Hardware Store as the pin is nothing special. It's just a Roll Pin or Spring Pin of 1/4"D x 3/4"L.
Awesome! Ill grab a solid version on my way home from work at the industrial supply place. Thanks!!
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post #13 of 33 Old 01-17-2020, 09:46 AM
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Quote:
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Awesome! Ill grab a solid version on my way home from work at the industrial supply place. Thanks!!


Solid dowel pins are very hard and if it shears off, you wont be able to get it out. Its a blind hole in the cam shaft where the pin inserts.
If you are still favoriting a solid dowel pin, purchase one with pullout threads so it can be removed if need be. You may have to use Retaining Compound to keep it inserted as well since it will not be spring loaded like a spring pin.


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post #14 of 33 Old 01-17-2020, 10:04 AM
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Keith beat me to it. A solid pin will be exactly .25" in diameter. The spring pin is actually .258". then compresses to .25, so it will stay in place.

Matt


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post #15 of 33 Old 01-17-2020, 11:16 AM
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Quote:
Originally Posted by John Strenk View Post
I don't know if you can do it on your cam but after the first incident, I added a second pin.

Just for redundancy.

My problem with the first cam was that the cam bearing clearance was too small and when it heated up, the cam had too much drag added with the taller lift put a lot of stain on that little pin.

But it's just a suggestion, You might not ever have another problem with it.

I always wanted to try some of those offset pins sets where you can adjust the cam timing.

The replacement timing chain set for my SBF and SBC have 3 key ways cut in them - they move the cam +/- 4 degrees. Wonder if new ones for the AMC has that.



Or, drill new a new hole in the cam gear? Too bad it takes so much to get into there to change. Drill holes every 2 degrees, put it back together, drive it, open it up again, adjust, repeat, until it is running how you like it.

Rick

1978 CJ5 5.0HO/T177/D300, '86 D30/D44 WT axles, 'glass body, 31x10.5 BFG A/T, TDK galv'd frame - DD and weekend toy


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