Lubricating the small end

[john.r.davies]

In Another Place, the question is, did early Trs (2/3/4?) have oilways from big to small end of the conrod, OR a squirt jet at the big end to direct cooling oil at the piston?

 

I'll be grateful to know the answer, so that I may bring light to those in Outer Darkness.

John

[Richard71]

https://www.rimmerbros.co.uk/Item--i-GRID200007

 

The pic on this page appears to show an oil passage drilled into the conrod, I've never heard any of the 2,3 or 4 owners mention a piston cooling/lubrication jet, that doesn't mean there isn't any though???

 

Richard.

[john.r.davies]

Yes, Richard, I see that the photo of the TR4 'rod does show a hole in line with the conrod beam!

I presume that is an oilway, that takes oil up the small end?

Thank you!

 

John

Edited September 7, 2017 by john.r.davies

[ianc]

Ian Gibson has provided the following response:

the con rod drilling goes right through to the little end. Thus if you replace the little end bushes you have to be careful to line up the oil hole as you draw them in. There is a side-drilling to give a squirt of oil onto the liner just below the piston skirt.

 

It's a long time since I examined a con rod, but I seem to recollect that the side drilling goes across the con rod, so that oil squirts out both sides onto the liner.

 

I believe that the Jaguar XK engine, an even more famous wet-liner engine, has a similar arrangement. The combination of a wet liner of superior material to that of the block (cast iron), and direct lubrication to the inside of the liner, accounts for the well-known longevity of these engines. I was talking to Neil Revington earlier in the week, and he was telling me that TKR49, his well-known TR2, has covered over 400,000 miles on its engine without any major work - and it still performs exceedingly well.

 

Ian Cornish