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Author Topic: 94 5.2 Magnum timing problem  (Read 1901 times)

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Offline Super_Bee

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94 5.2 Magnum timing problem
« on: March 14, 2009, 09:34:20 PM »
 My Ram Van stalled at a stop sign today and wouldn't restart. Towed it home.Had spark from coil and could hear fuel pump run. has 216,000 so I figured timing chain finally went. Set damper mark at TDC and dist rotor points to #6 on dist cap. Removed timing cover to find a steel cam gear and the marks line up.Must have been replaced before I bought it at 100,000 miles. Anyway the cam and crank marks line up but the rotor points to 6 on the drivers side and #1 is on the pass. side. 180 degrees out.I've had a lot of Mopars in the last 35 yrs and replaced a lot of timing chains but how did the distributor get 180 degrees out if it wasn't removed and the crank and cam gears are aligned. Might have to pull the dist. and look around down there.

Offline ToxicDoc

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Re: 94 5.2 Magnum timing problem
« Reply #1 on: March 14, 2009, 11:18:18 PM »
My Ram Van stalled at a stop sign today and wouldn't restart. Towed it home.Had spark from coil and could hear fuel pump run. has 216,000 so I figured timing chain finally went. Set damper mark at TDC and dist rotor points to #6 on dist cap. Removed timing cover to find a steel cam gear and the marks line up.Must have been replaced before I bought it at 100,000 miles. Anyway the cam and crank marks line up but the rotor points to 6 on the drivers side and #1 is on the pass. side. 180 degrees out.I've had a lot of Mopars in the last 35 yrs and replaced a lot of timing chains but how did the distributor get 180 degrees out if it wasn't removed and the crank and cam gears are aligned. Might have to pull the dist. and look around down there.

It is late and I've had the flu all week and I haven't touched a timing chain in 3 years, so I may not be thinking straight.  But can the gear marks line up at TDC but be on the exhaust stroke?
« Last Edit: March 14, 2009, 11:21:02 PM by ToxicDoc »
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Offline Super_Bee

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Re: 94 5.2 Magnum timing problem
« Reply #2 on: March 15, 2009, 12:47:05 AM »
I thought about that. The only way the distributor will point to # 1 is if the cam gear dot is at the top. I found a timing chain replacement article on another forum involving a Magnum V8 and he said his was indexed at #6 with the marks lined up but fired up when done. I found another involving a Magnum V6 and his was indexed at #4 which is 180 degrees off on that motor. I didn't know my chain had been replaced before I bought it but I will put the new chain and gears in and button it up so I can find the real problem.

Offline chrysler300le

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Re: 94 5.2 Magnum timing problem
« Reply #3 on: March 15, 2009, 01:37:50 AM »
Magnum engines use steel timing chains and will virtually last forever.  Well at least the life of the engine.  At TDC the pointer needs to point towards the pass fender.  there is a mark on the housing or plastic pick up where the pointer should point at TDC.
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Re: 94 5.2 Magnum timing problem
« Reply #4 on: March 15, 2009, 02:59:37 AM »
I just went out and looked at the plastic plate and it does have a mark toward the right fender but mine points to the left fender. I removed the distributor and checked the oil pump drive gear and the distributor shaft and everything checks out fine. I could turn it 180 and it would line up but it was pointing the wrong way before the distributor was moved and the timing gears were lining up right.

Offline chrysler300le

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Re: 94 5.2 Magnum timing problem
« Reply #5 on: March 15, 2009, 06:33:12 AM »
I've heard of timing gears being marked wrong.  Try it with the distributor 180 degrees different.  If it don't work then your problem is elsewhere.
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Re: 94 5.2 Magnum timing problem
« Reply #6 on: March 15, 2009, 11:24:23 AM »
I looked at the old gear marks and the new ones in relation to the keyway slots and everything is the same. I will put it back together and do whatever I have to with the distributor but its not gonna start anyway until I find the cause. But i will know its not the chain.

gen1dak

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Re: 94 5.2 Magnum timing problem
« Reply #7 on: March 15, 2009, 01:43:29 PM »
Barkin' up the wrong tree. The Magnum timing chains last so long and continue to maintain good timing is due to steel construction and the tensioner. It's quite probably the original. If you're getting fire, that's good. Remember, the distributor isn't like the past models. The ignition signal depends on the crank sensor, which plays a part in the timing sequence. So, unless you sheared the distributor drive sitting at idle, and just happened to shut down with everything perfectly aligned 180-out, I'd look elsewhere. Just because you hear the fuel pump doesn't mean you're getting fuel. Filter could be clogged. Could be one of several sensors that have failed. Start with a fuel pressure test on the fuel log. Since you already have the cover off, put a new timing set on, also a new tensioner (they don't last forever), but don't re-engineer the alignment setup on unfounded "what ifs" or suppositions that the marks are wrong. Line it up and move on.

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Re: 94 5.2 Magnum timing problem
« Reply #8 on: March 17, 2009, 12:45:18 PM »
I put the new chain and gears in which takes a load off my mind because the early Magnums don't have the tensioner. I had fuel pressure and the injectors were pulsing. Had spark but not as blue as I'd like so I plugged in a spare coil I had and it fired right up. Let it run a few minutes and shut it off and plugged the old coil back in and no start . Put the new coil on and all is good. I believe the old coil was getting weak for some time because it idles smooth now and it would get a little rough at times before. Thanks to all who helped out.

gen1dak

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Re: 94 5.2 Magnum timing problem
« Reply #9 on: March 17, 2009, 11:12:12 PM »
Fire wasn't as blue as you'd like? Way to go old school! I love it! By the way, you can add the tensioner with a bolt-in replacement from Mopar Performance if you get a wild hair and feel the need to tear the front off the engine again. It's a replacement cam thrust plate with the tensioner built in....the same part used from the factory.
« Last Edit: March 17, 2009, 11:16:00 PM by gen1dak »