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Old 07-28-2016, 10:22 AM   #1 (permalink)
floyd400
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DIY Timing chain replacement for dummies

I'm working on a mechanical 6.5 turbo diesel and while I have the front cover off my buddy wants me to replace the timing chain. Problem is that I don't know how to get the old chain off. Once the big bolt in the center of the cam gear is off what else do I need to do because the gears and chain won't slide all the way off. Do I need a puller to get the crank gear off? And is lining the timing marks up even necessary since everything is keyed and can only go in one way?

I read though the GM service manual and it simply says to "remove timing set" after the front cover is off. Really helpful. No wonder even GM techs screw things up when doing repairs. If someone can break it down and give me the "for dummies" version of how to do this I'd really appreciate it. Thanks

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Old 07-28-2016, 10:33 AM   #2 (permalink)
quadstar87
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Line up the dots before disassembling. Mostly for the IP gear since it can mesh anywhere.

Put a little pressure on the lower gear with a 2 jaw puller. Heat it slowly with a mapp torch (or similar) and it'll POP!. Apply light heat the rest of the way off, should be fairly easy. Don't heat the crank or the main bearing behind the gear too much.

Heat the new one and slide it on. Don't go crazy with heat, should only need (250*-300*) Make sure the chain is on it before it goes all the way in. Easy peasy.

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Old 07-28-2016, 10:34 AM   #3 (permalink)
quadstar87
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And don't forget loc-tite on the cam bolt and IP gear bolts. Sucks when you realize you forgot and already have the timing cover back on : )
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Old 07-28-2016, 10:41 AM   #4 (permalink)
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Quote:
Originally Posted by floyd400 View Post
I'm working on a mechanical 6.5 turbo diesel and while I have the front cover off my buddy wants me to replace the timing chain. Problem is that I don't know how to get the old chain off. Once the big bolt in the center of the cam gear is off what else do I need to do because the gears and chain won't slide all the way off. Do I need a puller to get the crank gear off? And is lining the timing marks up even necessary since everything is keyed and can only go in one way?

I read though the GM service manual and it simply says to "remove timing set" after the front cover is off. Really helpful. No wonder even GM techs screw things up when doing repairs. If someone can break it down and give me the "for dummies" version of how to do this I'd really appreciate it. Thanks

Is this the manual you read??


Here is the 1995 C/K truck manual, section 6 Engine in pdf. format
Timing chain replacement starts on page #18
https://www.dieselplace.com/forum/***....5l-engine.pdf
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Last edited by OkDually; 07-28-2016 at 10:44 AM.
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Old 07-28-2016, 10:56 AM   #5 (permalink)
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Quote:
Originally Posted by OkDually View Post
Is this the manual you read??


Here is the 1995 C/K truck manual, section 6 Engine in pdf. format
Timing chain replacement starts on page #18
https://www.dieselplace.com/forum/***....5l-engine.pdf
No mine was for a 92 or 93 but they say basically the same thing: "remove timing chain" lol
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Old 07-28-2016, 11:04 AM   #6 (permalink)
floyd400
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Quote:
Originally Posted by quadstar87 View Post
Line up the dots before disassembling. Mostly for the IP gear since it can mesh anywhere.

Put a little pressure on the lower gear with a 2 jaw puller. Heat it slowly with a mapp torch (or similar) and it'll POP!. Apply light heat the rest of the way off, should be fairly easy. Don't heat the crank or the main bearing behind the gear too much.

Heat the new one and slide it on. Don't go crazy with heat, should only need (250*-300*) Make sure the chain is on it before it goes all the way in. Easy peasy.
Thanks. Is it a just a tight press fit and the heat loosens it up? How do I go about putting it back on, with a rubber mallet? So I line up the dots on the crank and cam gears so one is at 12 and one is at 6 or get them both at 12 o'clock position? I have never done a timing chain on anything before so this is all a new world for me looking at this.
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Old 07-28-2016, 11:08 AM   #7 (permalink)
floyd400
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One more question, the IP and front cover are already off so will that matter when I go to turn the motor over to line up the dots on the crank and cam gears?
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Last edited by floyd400; 07-28-2016 at 11:08 AM.
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Old 07-28-2016, 12:15 PM   #8 (permalink)
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Quote:
Originally Posted by floyd400 View Post
One more question, the IP and front cover are already off so will that matter when I go to turn the motor over to line up the dots on the crank and cam gears?
There's full instructions in the service manuals in the FAQ area. I don't want to mis quote them but i'd recommend grabbing them and taking a look. Just because they are keyed doesn't mean you can't get the chain off a tooth.

All I remember was having the big dot on the outer cam gear at 12 O'Clock so I knew where to put the IP gear back.
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Old 07-28-2016, 12:18 PM   #9 (permalink)
quadstar87
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Just found this after I typed the last post. I rotated it so the dot on the outer cam gear was at 12 O'Clock and the dots on the timing chain gears matched up. That ensures you get it all back where it needs to be.


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Old 07-29-2016, 07:07 AM   #10 (permalink)
floyd400
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Ok I'm going to have to find that manual and read up on this because I'm slightly more confused now than before

Does it matter if the engine is turned over without the IP installed?

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Last edited by floyd400; 07-29-2016 at 07:08 AM.
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