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Old 09-24-2013, 05:58 PM   #1
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Timing Chain Replacement

Dove into the replacement today as the noise was pissing me off. Sounded like a diesel when it warmed up. Using the stethoscope it was pretty clear where the noise was coming from. I was just hoping to find evidence of slap because unless it's under torque it really is not evident when trying to flex the chain.

The rub guard was missing with pieces scattered about and I was happy to find rub marks on the inside cover. You can see 2 sets of rubs on the tabs that hold the rub strip.
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Old 09-24-2013, 07:08 PM   #2
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Makes sense as unless the crank is spinning and the chain dragging the cam around against valve spring resistance any chain slack is divided onto both sides but when the motor is running the side pulling the cam gear is tight so all the slack is on the side where the crank sprocket is pushing the chain toward the cam sprocket

If with chain on and cover off and plugs removed if you crank with a wrench on the crankshaft in the normal direction of engine rotation up until you feel most cam resistance but not past that point it should put all the chain slack essentially on one side

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Old 09-24-2013, 07:24 PM   #3
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Well I found the rub marks on the side opposite the tensioner so that's on the side where it's being dragged around right ? As the chain feeds into the crank sprocket.
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Old 09-26-2013, 05:18 PM   #4
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Finished the replacement and started her up last night and what a difference. Went from a Detroit diesel to a singer sewing machine.

Replacement went very smooth, just glad I did not follow the Chrysler service manual. No wonder they charge so much at the dealerships. The tell you to remove the alternator, AC compressor and recommend removing the water pump !
None of these devices were remotely in the way, once you remove the fan housing, fan and pulley it's wide open to the timing cover.
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Old 09-26-2013, 05:29 PM   #5
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Great success! Is your jeep a 4 or 6 cylinder as I thought only the 4 had the spring loaded tensioner

Does your TR6 have the overdrive unit? Had a few TR3 in my youth but never a 6
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Old 09-26-2013, 05:39 PM   #6
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It's a 2.5 I4 There was one pic that shows the tensioner spring fully extended which told me it was done.

I wish I had the overdrive. Almost nailed one from a local part out until he realized what it was worth.

Unfortunately the TR6 is a Hurricane Sandy victim, she took about 18" of salt water but fortunately did not enter the engine. She is in line for my repair spot in the garage. Hopefully she winds up a survivor.
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Old 09-26-2013, 06:23 PM   #7
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How long did it take you to do all that? I've never done one before. I was thinking about doing mine, but it seems intimidating.
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Old 09-26-2013, 07:14 PM   #8
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Quote:
Originally Posted by t3456 View Post
How long did it take you to do all that? I've never done one before. I was thinking about doing mine, but it seems intimidating.
I had not done a straight replacement either but it was very straight forward. Took me about 6 hours start to finish, but I was not hard at it.
You will need a Harmonic balance wheel puller ($20) and a torque wrench. I was able to use the original oil pan gasket (front section seals the bottom of timing cover) as it was pristine. I did bead RTV sealant on all surfaces. I bought the upgraded Felpro gasket set with the repair sleeve for the Harmonic balancer and the oil seal.

I do suggest that the oil be changed before starting the engine as the oil pan is exposed below the assembly and I was scraping and cleaning surfaces.

Very happy with a normal sounding engine.

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