1933 8-105 Timing Chain Install

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22 Jun 2019 19:54 #37576 by curtiss
1933 8-105 Timing Chain Install was created by curtiss
I am installing the timing chain in the 8-105 and I am a little puzzled. The car was running find when I took it apart (other than the broke ring it had) and the picture below is how the old one was installed, it counts 12 teeth between the marks but the attached manual says it should be 13.

Do I install the new one the way it came out or do I do it as the manual says? What happens if it is a tooth off?



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22 Jun 2019 23:38 #37580 by Ivor
Replied by Ivor on topic 1933 8-105 Timing Chain Install
Hello Curtiss, To set your mind at ease I recommend you check the actual valve timing as it is important it be correct for your model. It is easy to do if you have the head off and with a magnetic base dial indicator or cigarette paper under the valve head you can check when the valve starts to open. To do this you first need to set the valve clearance to 0.010" on say number one cylinder (note this is not the running clearance) then check the actual timing as per the chart attached. For your 8-105 It looks like it should be Intake open 5 deg before UDC and Close 40 deg after LDC. Exhaust opens 50 deg before LDC and closes 10 deg after UDC. Good luck.
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23 Jun 2019 00:27 #37581 by Ivor
Replied by Ivor on topic 1933 8-105 Timing Chain Install
Better image I hope, Valve timing should also be in the 8-105 handbook if you have one.
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23 Jun 2019 03:31 #37583 by Ivor
Replied by Ivor on topic 1933 8-105 Timing Chain Install
More information, I notice that "Motors" state 0.012" valve clearance for setting vale timing on the 8-105 not 0.010" , attached is a simple check using the number of teeth on the flywheel, Note also they state 12 links between punch marks.
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08 Jul 2019 17:44 #37709 by Terry
Replied by Terry on topic 1933 8-105 Timing Chain Install
Curtiss If you are 100 percent sure that there was only twelve links between Cam and Crank gear marks I would put it back that way. As Ivor shows in a previous post it also showed 12 links in between . I have a 1933 Motors manual and it also says 12 link pins between punch marks. As for setting the valve clearance, It really has nothing to do with the timing chain marks. If chain is put on as it is supposed to be you can do all the settings later.
Hope this helps Terry

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  • mikespeed35
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08 Jul 2019 20:19 #37712 by mikespeed35
Replied by mikespeed35 on topic 1933 8-105 Timing Chain Install
Not valve clearance, but valve timing. Two different things. Valve clearance has little to do with timing chain. Valve timing has everything to do with the timing chain. A little change in a word makes all the difference.
CORDiallyMike

Mike Huffman
The following user(s) said Thank You: Jonathan Richards

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