Timing chain olds 403
June 22nd, 2021, 02:32 PM
#1
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Join Date: Mar 2021
Posts: 17
Timing chain olds 403
Hello,
This timing chain seems too loose to me.
But the chains and sprockets don't seem to be really worn yet.
What's smart to do?
I hope you have some good advice.
Jarco
Last edited by jarco; June 22nd, 2021 at 02:37 PM.
June 22nd, 2021, 03:48 PM
#2
Oldsdruid
Join Date: Dec 2007
Location: Southside Vajenya
Posts: 10,535
How many miles on engine?
Can't get a good look but appears the cam gear is all steel which means it's been replaced.
Since you're already that deep into it, replace it on general principle. Timing sets are cheap enough.
Can't get a good look but appears the cam gear is all steel which means it's been replaced.
Since you're already that deep into it, replace it on general principle. Timing sets are cheap enough.
June 22nd, 2021, 06:46 PM
#6
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Join Date: Jan 2013
Location: Laguna Vista, TX
Posts: 1,668
Cloyes Gear Timing Chain and Gear Sets in mine no problems! You should check the center to center measurement. Cloyes sells a reduced center distance set if needed.
Last edited by HighwayStar 442; June 22nd, 2021 at 07:37 PM. Reason: Reduced center distance set
June 22nd, 2021, 10:15 PM
#7
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June 22nd, 2021, 10:26 PM
#9
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June 23rd, 2021, 03:15 AM
#10
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Location: Laguna Vista, TX
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https://www.cloyes.com/part-finder/?...=applicationhp
Center Distance = 5.044
0.005" Reduced Center Distance Set for Align Honed/Bored Blocks Center Distance = 5.039
Engine builder on here know better than me. I am just a engine assembler who done a few.
Center Distance = 5.044
0.005" Reduced Center Distance Set for Align Honed/Bored Blocks Center Distance = 5.039
Engine builder on here know better than me. I am just a engine assembler who done a few.
June 23rd, 2021, 04:42 AM
#11
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Join Date: Dec 2016
Location: Beautiful Southern Maryland
Posts: 1,490
Boy that is looooose 
That does not look like a Cloyes part number to me. More likely a cheap knockoff. I have been using Cloyes timing sets for over 30 years and have never had an issue with them.
Can you find out the history of the engine ? You really need to measure center to center but that is very difficult if not impossible to do on an assembled engine. Do you have anyone close by that might have a stock timing set you can try first before you order a new one ? Where are you located ?
If your problem is caused by the chain being stretched and you order a set for the shorter center to center then it will probably be too tight. You might just need a new timing set to fix the issue.
That does not look like a Cloyes part number to me. More likely a cheap knockoff. I have been using Cloyes timing sets for over 30 years and have never had an issue with them.Can you find out the history of the engine ? You really need to measure center to center but that is very difficult if not impossible to do on an assembled engine. Do you have anyone close by that might have a stock timing set you can try first before you order a new one ? Where are you located ?
If your problem is caused by the chain being stretched and you order a set for the shorter center to center then it will probably be too tight. You might just need a new timing set to fix the issue.
June 23rd, 2021, 05:26 AM
#12
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Join Date: Mar 2021
Posts: 17
Boy that is looooose That does not look like a Cloyes part number to me. More likely a cheap knockoff. I have been using Cloyes timing sets for over 30 years and have never had an issue with them.
Can you find out the history of the engine ? You really need to measure center to center but that is very difficult if not impossible to do on an assembled engine. Do you have anyone close by that might have a stock timing set you can try first before you order a new one ? Where are you located ?
If your problem is caused by the chain being stretched and you order a set for the shorter center to center then it will probably be too tight. You might just need a new timing set to fix the issue.
That does not look like a Cloyes part number to me. More likely a cheap knockoff. I have been using Cloyes timing sets for over 30 years and have never had an issue with them.Can you find out the history of the engine ? You really need to measure center to center but that is very difficult if not impossible to do on an assembled engine. Do you have anyone close by that might have a stock timing set you can try first before you order a new one ? Where are you located ?
If your problem is caused by the chain being stretched and you order a set for the shorter center to center then it will probably be too tight. You might just need a new timing set to fix the issue.
I'm going to measure the center to center size and I order one new timing set.
June 23rd, 2021, 06:46 AM
#13
Out of Line, Everytime😉
Join Date: Dec 2006
Location: Melville, Saskatchewan
Posts: 9,140
The Cloyes Street roller had that sloppy issue, the other ones seem fine. Another member got one with the same issues as mine. He went with the Cloyes Billet 9 way set Mark recommends and uses in the build. It was way tighter out of the box. Seriously, mine looked like that after just a few thousand miles. If the motor was a recent rebuild, he may need the reduced distance set. I may also need that set, it depends on how much is removed with an align hone.
June 23rd, 2021, 03:19 PM
#15
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Join Date: Nov 2008
Location: Central Fl
Posts: 7,971
A timing chain lesson- most of your inexpensive 3 keyway sets come from one or two manufacturers. They may say “Made in USA” on the crank sprocket and most think the whole set is made here. WRONG! All that means is that gear is made here. Typically the chain is from overseas and the cam sprocket can be from anywhere.
if you want a truly matched set then use the Cloyes 9-3613x9. From there they offer sets for line bored applications. Anyone want to guess how those sets compensate for a shorter centerline distance?
Hope this helps.
Mark
June 23rd, 2021, 03:22 PM
#16
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Join Date: Jan 2013
Location: Laguna Vista, TX
Posts: 1,668
Cloyes has that number. That’s how they gauge their sets.
A timing chain lesson- most of your inexpensive 3 keyway sets come from one or two manufacturers. They may say “Made in USA” on the crank sprocket and most think the whole set is made here. WRONG! All that means is that gear is made here. Typically the chain is from overseas and the cam sprocket can be from anywhere.
if you want a truly matched set then use the Cloyes 9-3613x9. From there they offer sets for line bored applications. Anyone want to guess how those sets compensate for a shorter centerline distance?
Hope this helps.
Mark
A timing chain lesson- most of your inexpensive 3 keyway sets come from one or two manufacturers. They may say “Made in USA” on the crank sprocket and most think the whole set is made here. WRONG! All that means is that gear is made here. Typically the chain is from overseas and the cam sprocket can be from anywhere.
if you want a truly matched set then use the Cloyes 9-3613x9. From there they offer sets for line bored applications. Anyone want to guess how those sets compensate for a shorter centerline distance?
Hope this helps.
Mark
June 23rd, 2021, 04:42 PM
#17
Out of Line, Everytime😉
Join Date: Dec 2006
Location: Melville, Saskatchewan
Posts: 9,140
Cloyes has that number. That’s how they gauge their sets.
A timing chain lesson- most of your inexpensive 3 keyway sets come from one or two manufacturers. They may say “Made in USA” on the crank sprocket and most think the whole set is made here. WRONG! All that means is that gear is made here. Typically the chain is from overseas and the cam sprocket can be from anywhere.
if you want a truly matched set then use the Cloyes 9-3613x9. From there they offer sets for line bored applications. Anyone want to guess how those sets compensate for a shorter centerline distance?
Hope this helps.
Mark
A timing chain lesson- most of your inexpensive 3 keyway sets come from one or two manufacturers. They may say “Made in USA” on the crank sprocket and most think the whole set is made here. WRONG! All that means is that gear is made here. Typically the chain is from overseas and the cam sprocket can be from anywhere.
if you want a truly matched set then use the Cloyes 9-3613x9. From there they offer sets for line bored applications. Anyone want to guess how those sets compensate for a shorter centerline distance?
Hope this helps.
Mark
June 24th, 2021, 08:08 AM
#20
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Join Date: Dec 2016
Location: Beautiful Southern Maryland
Posts: 1,490
Take the metal splash shield off the crankshaft and then take a picture from the front showing both sprockets and the chain. If the distributor is still in the engine do not remove it or turn it in any way.
June 24th, 2021, 02:13 PM
#23
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Join Date: Mar 2021
Posts: 17
[QUOTE=Sugar Bear;1351218]Can you attribute the difference to anything specific e.g., gear vs. chain vs. some of both?
Glad to see it works, good luck!!
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