Cam Gear

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CraigKennedy
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Cam Gear

Postby CraigKennedy » Mon Mar 23, 2015 8:58 pm

Is this normal? I have tried to look at other pic, but cannot find any pic of the engine side of the cam shaft gear
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Re: Cam Gear

Postby Barnyard » Mon Mar 23, 2015 9:09 pm

Time to replace it. It won't be long before it wears completely and possibly wipes out other pieces.
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Re: Cam Gear

Postby bob in CT » Mon Mar 23, 2015 9:14 pm

I would not replace anything until I found the problem. This is a symptom, not the source.

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Re: Cam Gear

Postby CraigKennedy » Mon Mar 23, 2015 9:19 pm

Barnyard, Bob, in addition to my previous post, I have found this, also my Idler gear bushing has wear on it, and I had a valve that was rubbing in the guide. In my previous post, I was trying to find the source of metal flakes in my oil pan. I'm not sure why the cam gear is worn??? and not sure why my Idler bushing is worn either? nothing else looks to be worn on the cam?

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Re: Cam Gear

Postby Eugene » Mon Mar 23, 2015 9:26 pm

What is the history on this engine/tractor?
I have an excuse. CRS.

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bob in CT
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Re: Cam Gear

Postby bob in CT » Mon Mar 23, 2015 9:27 pm

what did you measure?

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Re: Cam Gear

Postby CraigKennedy » Mon Mar 23, 2015 9:38 pm

Eugene, tractor was a used for a mower, P.O ran into something longgg ago breaking radiator, water outlet, hood, dash. Saw evidence that he went into the brakes before, have not seen where anything has been done in the engine tho.
Bob, Measure what?

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bob in CT
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Re: Cam Gear

Postby bob in CT » Mon Mar 23, 2015 9:56 pm

bob in CT wrote:
CraigKennedy wrote:Bob, Do you think my thrust plate is worn? 1/8" is a generous figure put it nowhere a press fit? didn't see any shavings around it and didn't look like its been grinding


Read the linked manual on the topic. Search for "thrust" and you will come to the installation instructions and specs. Measure and report. At this point, I don't think. I measure. :lol:

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Re: Cam Gear

Postby CraigKennedy » Mon Mar 23, 2015 10:35 pm

Bob, The gear looks like its setting to one side just a hair, but its going to be replaced anyway but the clearance is .009

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Re: Cam Gear

Postby Clark Thompson » Mon Mar 23, 2015 10:51 pm

The wear on the gear is normal due to that is the part of the gear teeth that drives the hydraulic pump. as suggested previously, the gear needs to be replaced. If not you may end up with all the rest of the timing gears broken along with the hydraulic pup shaft. I would replace the idler gear bushing as well. The bushing is avalible but if you dont have the proper tooling to fit the bushing to the shaft after installing the bushing / bearing in the gear it wont fit the shaft. The bearing is babit and requires a special hone to fit the bushing. I believe the clearence is .002 to .003....oo1 is better. I would also check for excessive wear on the crank gear and timing idler gear.
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Re: Cam Gear

Postby CraigKennedy » Mon Mar 23, 2015 11:30 pm

Clark, The crank gear has no signs of wear, will have to check the TC pump tomorrow night. the Idler gear doesn't have any wear on the teeth, but the bushing/bearing has some deep scratches in it. Do you know the part # and a website that sells the bushing? Is it possible to resize the bushing/bearing with 320 grit sandpaper by hand, along with a micrometer?
Also have you had this problem before? with metal flakes in the oil pan?

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bob in CT
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Re: Cam Gear

Postby bob in CT » Tue Mar 24, 2015 7:39 am

You can find part numbers in the pdf manual section above. Look for the TC-37F 79 version labeled "OCR". That is my best scan and it is the last version. You can polish the idler gear shaft with some crocus cloth. 320 grit is way too coarse. I would just give it to a local machine shop as they will need to hone the bushing anyway. You will get is back fitted properly. I had to do this in the engine I just built. Messick's has a web site you can order IH parts from.

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Re: Cam Gear

Postby John *.?-!.* cub owner » Tue Mar 24, 2015 10:00 am

I know it is not my money I am talking about spending, but if you have an old time engine machine shop in your area with experience on the old farm engines I would give serious thought to taking it to them for a tear down and boiling, measuring of bearings, etc. With that kind of wear I would take a close look at the TC pump gear, and even wonder about oil circulation.
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Re: Cam Gear

Postby Boss Hog » Tue Mar 24, 2015 2:31 pm

This may have been better to leave it in one post, I think if you try to get a good used Idler assy you will be money ahead. Hamilton Bob should have a good one out of one of the late model # cubs. I am sure the Idler that the Idler gear rides on it worn also.
Just my opinion, and I am right most of the time :lol: :wink:
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Re: Cam Gear

Postby Boss Hog » Tue Mar 24, 2015 2:33 pm

John *.?-!.* cub owner wrote:I know it is not my money I am talking about spending, but if you have an old time engine machine shop in your area with experience on the old farm engines I would give serious thought to taking it to them for a tear down and boiling, measuring of bearings, etc. With that kind of wear I would take a close look at the TC pump gear, and even wonder about oil circulation.


John, it looks like it may have been run with the pump and or pump gear loose
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