I have heard of the scroll type rear crank seal but never seen one and it certainly isn't shown in the parts list. I suspect as you do that it is from the vanguard engine along with the crankshaft, which would fit the tractor block. The tensioner on the timing chain is home-made, on the tractor you just have the chain, there is no need for a tensioner, if the chain does wear then it should be changed. Usually chains have a good life and the Governor is what may fail first and when you tear the engine down to repair that, you will see the chain and change it. The chain should be changed anyway when repairing the Governor. Using a tensioner can allow the timing to be slightly out because of the wear in the chain, there is no allowance for this. The Camshaft has infinitely variable timing that needs to be set correctly as it isn't straight forward unless you know..PS. I have just looked at a Vanguard parts list and the Crank and the rear seal are as you describe, so it would appear that they are both from the Vanguard unit..John(UK)....fergusontractors@hotmail.com
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