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Standard Diesel Cam Timing

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Bob Akin

10-22-2000 20:51:01




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I have several TO35s with the Standard Deisel. I have had two of them apart and timed the cam on reassembly but have always wondered if the timing might be just a little bit off as one of these never ran quite as well as the other. It seems to me that the procedure in the IT manual is a little bit nebulous and leaves some room for some marginal error. There are six bolt holes in the big sprocket. The number of teeth on the sprocket is not divisible by six and so the timing can be changed by several degrees by attaching the sprocket in different positions. Also just a couple of thousanths off when adjusting the valves in the IT cam timing procedure will affect the cam timing several degrees. I will be putting one of these engines back together in a few days and would like any suggestions that anyone may have. Is there any more sure way to time these engines? Has anyone else had any trouble with this procedure.

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twopop

10-23-2000 19:26:24




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 Re: Standard Diesel Cam Timing in reply to Bob Akin, 10-22-2000 20:51:01  
according to the book,the cam sprocket can only be put on in one position



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Bob Akin

10-23-2000 20:11:32




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 Re: Re: Standard Diesel Cam Timing in reply to twopop, 10-23-2000 19:26:24  
The book does indicate that the sprocket only goes on in one position but I have found that is not the case with my tractors. I don't know if someone has bored the holes out but on both of my tractors the sprockets have five holes that are 7/16 and one that is 5/16. The one small hole must line up precisely with a hole but the others fit loosely enough to allow the sprocket to fit in any position. Is this normal?

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twopop

10-24-2000 07:58:09




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 Re: Re: Re: Standard Diesel Cam Timing in reply to Bob Akin, 10-23-2000 20:11:32  
i believe you are correct that someone bored out the holes.so therefore the cam timing would be off by degrees if the wrong holes were used.in rereading the i/t i cant find any mention of timing marks.i would suggest the following.set the camshaft on the #4 rocking position,then set crank with the key slots down and put the cam sprocket inside the chain and hold it in position with the chain tight.do not move the cam or crank.align one of the sprocket holes with the hole in the sprocket.as long as the chain is held tight i think you will have to reset the sprocket in the chain several times before you can get all the holes in the sprocket to line up.the most important one being the 5/16 hole.
twopop

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mick reed

11-04-2000 19:29:13




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 Re: Re: Re: Re: Standard Diesel Cam Timing in reply to twopop, 10-24-2000 07:58:09  
Could anyone please advise me on factory specs in degrees,inlet starts to open & @ what valve clearance {british standard diesel mf 35}.I have worked out that 1/8" on flywheel diam.= 1deg.{close enough}. Thanks & kind regards Mick Reed.



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