TD 049 crankshaft endplay ?

mattp51 Sun Jul 03, 2016 4:33 pm

I have a TD with a bit more front/back play than my others. I uninstalled and reinstalled the crank, no change. I assume something has worn from use. Would this be crankcase wear, or crankshaft wear?

706jim Sun Jul 03, 2016 5:17 pm

Most likely wear in the crankcase which is made of soft aluminum whereas the crank is hard steel.

pkrankow Sun Jul 03, 2016 5:27 pm

One would think it is crankcase wear. Most likely from using an electric starter on the engine. It could also be the thrust plate, or back cover, for the same reason.

Dirty bushing bearings do a funny thing, the bearing tends to not _wear_, but instead embed the dirt, making the bearing abrasive and wearing the shaft. This means the shaft should be checked.

thrust washers can be added
http://coxengines.ca/cox-.049-thrust-washer-steel-3.html

Phil

1/2A Nut Sun Jul 03, 2016 5:33 pm

Yes a phenolic or steel thrust washer will stop the play and help retain oil to some degree.

TDbandit Mon Jul 04, 2016 11:41 am

Yup like everyone else has said, sounds like excessive use with a starter, the TD .049 came stock with a thrust washer but it's possible the drive plate was once removed and the washer wasn't reinstalled. As Phil stated, go to Cox International and grab a couple of their thrust washers. Also I would tear it down and inspect the crankshaft for wear especially near the front and around the rotory valve.
(Bandit)

fredvon4 Mon Jul 04, 2016 12:40 pm

Just to be contrary I would not be so fast to claim e starter wore the crank case nose short.......may be it did but:

I have built a whole slew of TeeDees from parts, and can attest COX has long and short cranks and long and short Crank cases

the difference is subtle but there are cranks too small to turn drag free in some cases and some with a lot of slop fore and aft

And I also believe the OP could use as is with no thrust washer as it is NOT really a thrust washer...the prop pulls the crank forward in tractor use.... for pusher, yes, one is needed ----or for any thought of electric finger a thrust washer and shot of oil is needed

pkrankow Mon Jul 04, 2016 1:29 pm

fredvon4 wrote:Just to be contrary I would not be so fast to claim e starter wore the crank case nose short.......may be it did but:

I have built a whole slew of TeeDees from parts, and can attest COX has long and short cranks and long and short Crank cases

the difference is subtle but there are cranks too small to turn drag free in some cases and some with a lot of slop fore and aft

And I also believe the OP could use as is with no thrust washer as it is NOT really a thrust washer...the prop pulls the crank forward in tractor use.... for pusher, yes, one is needed ----or for any thought of electric finger a thrust washer and shot of oil is needed

Yes, I will also agree that there is enough statistical differences between the crank and case over years of production that it could be simply the combination of parts.
Phil

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TD 049 crankshaft endplay ?

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