Fat bottomed girls dropped

baz said:
My t160 is totally dry until really cane it
It gets a bit oil misty around the cylinder barrel area but not enough to drip on the floor
None of my commandos have ever leaked
It's 40 years since I've had pre unit triumphs,but I can remember rocker spindle leaks and pushrod tube and chaincase leaks
I've had a long running battle with my A10 especially with the gangly plate behind the clutch
I have ended up remaking this and fitting it with a proper oil seal
And I still have a slight rocker box leak despite my best efforts
Click to expand...
One of the problems with Triumph twins is that SO many parts between the models and years are similar enough to fit, without being right.

Pushrod tube tubes and seals are a classic example. Basically, if the right tubes and seals are used, and the crush is correct, and the engine is breathing properly, they do not leak. But it is very, very confusing as to what is correct. And too few people care to check things like the crush, even if they’re using none standard head gaskets, and things have been skimmed untold times, etc. They just fit ‘em and tighten ‘em and go!

Rocker spindles are similar, use the correct o rings and the correct assembly tool, and they’re usually fine. Use a scabby old second hand o ring and no assembly tool and it’s almost definitely gonna leak.

Also, as I learnt recently, some pattern gaskets are shite. I had rocker box and head gaskets crush and basically turn into a kind of powder !
 
Fast Eddie said:
One of the problems with Triumph twins is that SO many parts between the models and years are similar enough to fit, without being right.

Pushrod tube tubes and seals are a classic example. Basically, if the right tubes and seals are used, and the crush is correct, and the engine is breathing properly, they do not leak. But it is very, very confusing as to what is correct. And too few people care to check things like the crush, even if they’re using none standard head gaskets, and things have been skimmed untold times, etc. They just fit ‘em and tighten ‘em and go!

Rocker spindles are similar, use the correct o rings and the correct assembly tool, and they’re usually fine. Use a scabby old second hand o ring and no assembly tool and it’s almost definitely gonna leak.

Also, as I learnt recently, some pattern gaskets are shite. I had rocker box and head gaskets crush and basically turn into a kind of powder !
Click to expand...
3 or 4 years back I changed the exhaust rocker base gasket on the t160 for a Kevlar (I believe) gasket from the bonniville shop
And quad seals on the push rod tubes
 
baz said:
My t160 is totally dry until really cane it
It gets a bit oil misty around the cylinder barrel area but not enough to drip on the floor
None of my commandos have ever leaked
It's 40 years since I've had pre unit triumphs,but I can remember rocker spindle leaks and pushrod tube and chaincase leaks
I've had a long running battle with my A10 especially with the gangly plate behind the clutch
I have ended up remaking this and fitting it with a proper oil seal
And I still have a slight rocker box leak despite my best efforts
Click to expand...
I've been battling rocker box leaks on my A10 since 1998. One day I'll win!
 
MikeG said:
I've been battling rocker box leaks on my A10 since 1998. One day I'll win!
Click to expand...
Mines been an on off battle since 86
Strangely I had a much earlier plunger A10 and the rocker box never leaked on that one
I have read that the head steady is the cause of the leak
IE the engine wants to shake backwards and forwards
And the head steady bolted to the rocker box is trying to stop it
 
I solve rocker shaft seals by cleaning the exterior with MEK and then laying in a bead of RTV but use one of the
Yamabond clones. How anybody can get a o-ring in there undamaged, tool or no tool, is beyond me. Even with
the tool the o-ring is sliced. Hateful design, nearly as lame as using pushrod tubes and then having to figure the crush when the individual bits all end up with a similar crush no matter how you mix and match them. BSA unit
and Commando just put it all inside the head casting. The twin was built that way forever so I'll give them a pass
but the Trident could have easily just enlarged the cylinders and put the passages in there.
 
Onder said:
I solve rocker shaft seals by cleaning the exterior with MEK and then laying in a bead of RTV but use one of the
Yamabond clones. How anybody can get a o-ring in there undamaged, tool or no tool, is beyond me. Even with
the tool the o-ring is sliced. Hateful design, nearly as lame as using pushrod tubes and then having to figure the crush when the individual bits all end up with a similar crush no matter how you mix and match them. BSA unit
and Commando just put it all inside the head casting. The twin was built that way forever so I'll give them a pass
but the Trident could have easily just enlarged the cylinders and put the passages in there.
Click to expand...
On a pre unit you can take the sharp edge off the spindle hole
And polish the inside of the casting to give the oil an easier passage away
It all helps a little
 
The o-ring does go in but it loses some of its outer circumference. My bead of RTV in the champfer around the shaft does the trick with a lot less bother.
 
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baz said:
Mines been an on off battle since 86
Strangely I had a much earlier plunger A10 and the rocker box never leaked on that one
I have read that the head steady is the cause of the leak
IE the engine wants to shake backwards and forwards
And the head steady bolted to the rocker box is trying to stop it
Click to expand...
 

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My attempt at curing the head steady issue. This and a solid copper gasket. Got it down to a minor weep but still.....
 
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