Changing Timing Chain? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

muddpile · 08-21-2006, 01:21 AM

What do I need to know to change the timing chain and gears on my 350? I have the cover off already, and the chain is quite loose. I picked up a double roller/sprocket set, but I want to make sure I know what I'm doing so I don't screw it up. Are there any special tools required? What about precautions? Any help at all would be great. Thanks!

c-1072 · 08-21-2006, 01:27 AM

get a manual to be sure so its right in front of you, this way you can double ck everything . It is realy simple you already did the hard part . you just need to line up the two dots on the gears so they are in line top (crank gear ) to bottom (cam gear ) and swap the gears and chain out .

*trkklr77* · 08-21-2006, 01:33 AM

remember that quality sets will have multiple key ways in the lower gear for 0*, -4*, +4* of timing. you will only want 0/+4* unless your running massive nos/blower. make damn sure you get the marks right on, it can be a severe pain to get them moved just one tooth but you need to be dead on the marks.

muddpile · 08-21-2006, 02:57 AM

I think the small gear only has one keyway slot cut in it. What is the best method for getting the old gears off? I haven't tried anything yet. The top one looks like it just unbolts with three bolts, where the bottom looks a bit different. Do I need a gear puller or something?

*trkklr77* · 08-21-2006, 03:03 AM

yes you need a puller.

as for putting the new one on, o have always tapped it on with a peice of 1.25" pipe witha cap on it and GENTLE!!!!!!! taps, otherwise get an installer.

*rage'nrat638* · 08-21-2006, 07:24 AM

heres the bottom balancer installer

muddpile · 08-21-2006, 08:46 PM

Would a 3 claw gear puller work to pull them off? Also, is the only specialized tool I need that installer in the above picture?

*rage'nrat638* · 08-21-2006, 10:09 PM

yes the 3 jaw puller will do it...it's only going to be stuck on there a 1/4 or so.
and that installer is a must...

08-21-2006, 01:21 AM	#1
muddpile Registered User Join Date: Dec 2004 Location: Saskatchewan, Canada Posts: 1,371	Changing Timing Chain? What do I need to know to change the timing chain and gears on my 350? I have the cover off already, and the chain is quite loose. I picked up a double roller/sprocket set, but I want to make sure I know what I'm doing so I don't screw it up. Are there any special tools required? What about precautions? Any help at all would be great. Thanks! __________________ 1964 Chevy Short Fleet: Tornado 1972 Chevy C10: Fast Orange Secondaries Wide Open

08-21-2006, 01:27 AM	#2
c-1072 Registered User Join Date: Sep 2004 Location: rochester NY Posts: 777	Re: Changing Timing Chain? get a manual to be sure so its right in front of you, this way you can double ck everything . It is realy simple you already did the hard part . you just need to line up the two dots on the gears so they are in line top (crank gear ) to bottom (cam gear ) and swap the gears and chain out .

08-21-2006, 01:33 AM	#3
trkklr77 Account Suspended Join Date: Aug 2006 Location: vacaville ca, because it as far from indy as i can be Posts: 777	Re: Changing Timing Chain? remember that quality sets will have multiple key ways in the lower gear for 0, -4, +4* of timing. you will only want 0/+4* unless your running massive nos/blower. make damn sure you get the marks right on, it can be a severe pain to get them moved just one tooth but you need to be dead on the marks.

08-21-2006, 02:57 AM	#4
muddpile Registered User Join Date: Dec 2004 Location: Saskatchewan, Canada Posts: 1,371	Re: Changing Timing Chain? I think the small gear only has one keyway slot cut in it. What is the best method for getting the old gears off? I haven't tried anything yet. The top one looks like it just unbolts with three bolts, where the bottom looks a bit different. Do I need a gear puller or something? __________________ 1964 Chevy Short Fleet: Tornado 1972 Chevy C10: Fast Orange Secondaries Wide Open

08-21-2006, 03:03 AM	#5
trkklr77 Account Suspended Join Date: Aug 2006 Location: vacaville ca, because it as far from indy as i can be Posts: 777	Re: Changing Timing Chain? yes you need a puller. as for putting the new one on, o have always tapped it on with a peice of 1.25" pipe witha cap on it and GENTLE!!!!!!! taps, otherwise get an installer.

08-21-2006, 07:24 AM	#6
rage'nrat638 Account Suspended Join Date: Mar 2003 Location: THE FALL GUY CHICAGO IL Posts: 5,883	Re: Changing Timing Chain? heres the bottom balancer installer Last edited by rage'nrat638; 07-12-2007 at 07:02 AM.

08-21-2006, 08:46 PM	#7
muddpile Registered User Join Date: Dec 2004 Location: Saskatchewan, Canada Posts: 1,371	Re: Changing Timing Chain? Would a 3 claw gear puller work to pull them off? Also, is the only specialized tool I need that installer in the above picture? __________________ 1964 Chevy Short Fleet: Tornado 1972 Chevy C10: Fast Orange Secondaries Wide Open

08-21-2006, 10:09 PM	#8
rage'nrat638 Account Suspended Join Date: Mar 2003 Location: THE FALL GUY CHICAGO IL Posts: 5,883	Re: Changing Timing Chain? yes the 3 jaw puller will do it...it's only going to be stuck on there a 1/4 or so. and that installer is a must...

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