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RE: Crankshaft oilways
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Posted by nigel w (UK)   on Tuesday, January 12, 2021 at 15:44
- in reply to: Crankshaft oilways posted by alan lindsay on Monday, January 11, 2021 at 22:06
It is definitely worth enlarging the oil way from oil tank to oil pump from 5/16 to 3/8 diameter but make sure you do the whole pathway, and include the oil pump backplate iitself. You will see a useful increase in oil pressure. T160s were modified at the factory about half way through production but as stu says not consitently, for instance my late T160 had evrything at 3/8 diameter until we looked at the oil pump backing plate which was still at 5/16 (it was the original fitment)!
Replies   :
This Saudi T160 engine I have here is PN068## and that didnt' have the oil pump back plate
enlarged to 5/16" id bore, it was still at the earlier 1/4" id bore, however the oil tank through into
the engine was all the large 5/16" id bore feed. It's has a very late prodution date engraved into the pump body
so it's definitely the original oil pump.
>T160s were modified at the factory about half way through production but as stu says not consitently, for instance my late T160 had evrything at 3/8 diameter until we looked at the oil pump backing plate which was still at 5/16 (it was the original fitment)!
3/8" is the feed spigot OD (the upper one) or at least, that's what it is on my NN067xx T160 which is a reasonably late model.
The ID best as I can measure due to its position is approximately 0.300".
According to the Jack Shemans Service notes (published in Classic Mechanics issue 12, April/May 1986, reproduced in the TR3OC Service Notes, page 7, chapter 7) and which I have quoted the relevant section from, below:
"Jack Shemans:
A useful modification to the oil feedway involves removing the pipe, which has 1/4 inch bore, opening up the hole, right through to the oil pump housing and fitting a pipe with a 5/16 in. bore. This modification, a spin-off from the racing days, helps the oil get round more easily from cold and was incorporated in later models of the T160."
Therefore, 5/16" through to the pump would seem to have been the enlarged size.
Hi Nigel
What is your engine number? Or better yet, do you know when the oil pump inlet was enlarged to 3/8"
Cheers,
Mike K. My engine inumber 067##
and it had definitely never been apart before
Hi Mike,
IIrc, "L.A.B." posted them a while back; find the post with the Forum Search?
Hth.
Regards, |
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