Bloodknot
Well-Known Member
Having installed the E3134 cams in inlet and exhaust on my old Tbird I used to do the 2 thou by ear, it just becomes audible and the 4 thou from memory was a quarter turn of the adjuster.
Multiple Bent Pushrods
- Thread starter Woollybandit
- Start date
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Woollybandit
Well-Known Member
Exactly! I've been in Oil & Gas design for 50 years and never got used to mm even though steel is metric (but just inches converted) as are pipe sizes.
I too have an Italian v-twin except the cylinders stick out sideways and it seems weird to do the tappets at 0.15/0.20mm ..... just can't visualize it.
I hear the USA is adopting metric now. Wonder how that will go. I worked in Houston for a few years and the local guys were floundering with mm.
It'll never catch on!
Post #26:-
Summit Racing and Motion Pro are in the US; note the flag displayed under @Woollybandit's username ... It is not cheap to get stuff across the bit of water in between.
Woollybandit
Well-Known Member
Yes, I must've skipped over that. At least I spotted it before blocking flow at the banjo due to it not extending far enough out of the box.Post #26:-
Summit Racing and Motion Pro are in the US; note the flag displayed under @Woollybandit's username ... It is not cheap to get stuff across the bit of water in between.
Cheers Rudie
Surely there is a UK source...
Woollybandit
Well-Known Member
Don't sweat it, I'm just going to cut out the one's I use.
Cheers
speedrattle
Well-Known Member
if the pushrods were set with enough clearance to come off the tappets or rocker arm tips, then th emachine probably would not have run. i think you may be correct that the adjuster nuts were not tightened.
however, you have three bent pushrods. i cannot see how all three came loose at the same instant, and th emotor woul dhave stopped as soon as the first one came off. they dont come off a little bit-- theyre either on, loose or not, or theyre completely off.
i have just measured four kibblewhite 650 pushrods. all four are just over 160mm, or 6-5/16 inches.
measure the unbent pushrod from your motor, please. how long is it?
750 twin pushrods are shorter than 650 and have a cup at both ends.
750 twin pushrods are only slightly longer than T160 pushrods, the difference is small enough the pushrods are often confused but big enough to affect the valve gear geometry if the wrong pushrods are fitted in either engine.
Woollybandit
Well-Known Member
@ Speedrattle
Rods are 152mm, correct for a T140
I suggest that the pushrod cups may have been sitting on the edge of the rocker ball shoulder/lip and against the box wall. The rods were torn out of the gasket rod holes which being so close to the top of the rods may not have occurred during bending. For me the rods worked after a fashion in that position until the cups eventually dug into the wall and bent. Those gouges are pretty deep in post #24 photo.
The engine did start after the purchase and storage but not running well which I thought might be stale fuel/ethanol, but you have a point about three rods going at the same time. Upon assembly I will check rocker oil supply at the banjos again although plenty there on everything when I tore it down. The rockers are as free as you could get without looseness.
@ Rudie
I have pushrods from my T120 left over which measure 160mm. You couldn’t confuse them, in fact you’d have to severely bend them and still not get them in!
Rods are 152mm, correct for a T140
I suggest that the pushrod cups may have been sitting on the edge of the rocker ball shoulder/lip and against the box wall. The rods were torn out of the gasket rod holes which being so close to the top of the rods may not have occurred during bending. For me the rods worked after a fashion in that position until the cups eventually dug into the wall and bent. Those gouges are pretty deep in post #24 photo.
The engine did start after the purchase and storage but not running well which I thought might be stale fuel/ethanol, but you have a point about three rods going at the same time. Upon assembly I will check rocker oil supply at the banjos again although plenty there on everything when I tore it down. The rockers are as free as you could get without looseness.
@ Rudie
I have pushrods from my T120 left over which measure 160mm. You couldn’t confuse them, in fact you’d have to severely bend them and still not get them in!
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... they have been and are regularly confused by dealers and owners not familiar with T160's.
This is one of those fascinating whodunnit threads… and I feel lucky that I didn’t have this happen when I R&R’d the rocker boxes to install new gaskets on my Unit 650—which I’d never worked on before.
I do, however, remember it took me a while to be satisfied that I had the pushrods properly seated. Pretty fiddly process but once in place, they’ve stayed put—and I do not baby this engine.
I think what I did—after it felt like the pushrods were seated properly—was simply rotate the engine and check to see if the valves were opening and closing as they should, then set the clearances. But is there any other test one should or can run to ensure they’re copasetic and won’t jump out…?
I do, however, remember it took me a while to be satisfied that I had the pushrods properly seated. Pretty fiddly process but once in place, they’ve stayed put—and I do not baby this engine.
I think what I did—after it felt like the pushrods were seated properly—was simply rotate the engine and check to see if the valves were opening and closing as they should, then set the clearances. But is there any other test one should or can run to ensure they’re copasetic and won’t jump out…?
