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Victor pushrod/rocker arm question #784068 09/12/19 5:36 pm
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AML Offline OP
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I’ve belatedly begun to get my Victor running after a road-side stoppage in June and I’ve got a few questions.
I replaced an exhaust pushrod that had gotten hammered (shortened) and that seemed to be the extent of the damage.
But now with everything back together I have to screw in the tappet adjuster all the way down to get the 010 clearance, so much so that there is barely any of the adjuster showing above the lock but, which doesn’t seem right.
At TDC both pushrods are at the same height and the tapper adjusters are the same length. The exhaust valve is not stuck open as I can stand on the k/s after a few kicks, so it seems the valves are sealing.

I can only think that the rocker arm has bent. Is that possible?
Any thoughts as I’d rather not pull the rocker off again if I’m missing something obvious.

Adam

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Re: Victor pushrod/rocker arm question [Re: AML] #784070 09/12/19 6:41 pm
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This is a 69 B44 exhaust valve. I seem to have quite a few threads left. The head is quite original and the seats have not been ground. only lapping in the new valves.

It would seem to me that bending a rocker would be hard to do. Is the valve the correct length?

Gordo


click to enlarge
[Linked Image from i.postimg.cc]


The roadside repairs make for the best post ride stories.
Re: Victor pushrod/rocker arm question [Re: AML] #784074 09/12/19 7:11 pm
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I would check the push-rods for straightness by removing them from the head, once out, the hardened-end caps can be pulled off and the bare push-rods checked for straightness by rolling them on a flat surface.

If the push-rods are straight then its possible to fit a hardened washer under the cap to take up any slack, assuming this isn't too much.

Alternately you can have slightly longer push-rods made up by someone who has access to a lathe.

There is no way I would bend a rocker !

Last edited by gunner; 09/12/19 7:12 pm.

1968 A65 Firebird
1967 B44 Shooting Star
1972 Norton Commando
Re: Victor pushrod/rocker arm question [Re: AML] #784086 09/12/19 8:17 pm
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I bought a new pushrod from Peter at BSA unit Singles, and it and the intake pushrod are both straight and true. The damaged pushrod I removed is now about 8 inches long, as opposed to the normal 8.25”.
I’ve attached pix of both the intake and exhaust tappers and I don’t remember there being much difference between them before this.
I know I could probably just use a longer 8-3/8” square barrel pushrod but I think something else must be going on.
I wasn’t thinking of bending the rocker, I thought perhaps it could have been bent during running when the pushrod shortened?
Adam

Intake
[Linked Image from i.postimg.cc]
Exhaust
[Linked Image from i.postimg.cc]
[Linked Image from i.postimg.cc]

Re: Victor pushrod/rocker arm question [Re: AML] #784096 09/12/19 11:31 pm
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Gordo in Comox Offline
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I note that Rupert Ratio book shows the B44 pushrod at 8 5/16 inches and only the B50 has a longer pushrod at 8 7/16. There is no mention of the round and square barrel B44s having different pushrods.

Gordo


The roadside repairs make for the best post ride stories.
Re: Victor pushrod/rocker arm question [Re: AML] #784103 09/13/19 1:01 am
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Yes, I noted RR lists only one length, but there’s a difference in part numbers between the round and square barrel pushrods and BSA unit Singes and Baxter among others list different lengths (although they don’t agree) for the pushrods.

Re: Victor pushrod/rocker arm question [Re: AML] #784107 09/13/19 1:24 am
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Gordo in Comox Offline
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AML: Thanks for the info, as always this forum is better than most references.

Gordo


The roadside repairs make for the best post ride stories.
Re: Victor pushrod/rocker arm question [Re: AML] #784123 09/13/19 6:29 am
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kommando Online Content
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From the B50 site

41-0028 B40 7 11/16"
41-0592 B44 Round Jug 8 1/4"
41-0590 B44 Round GP 8" 1966-67 sand cast barrel
41-0790 B44 Square jug 8 3/8"

40-0100 C15 7 5/16"
40-1021 B25 Ex 6 7/8' aka 70-8053
40-1010 B25 IN 6 15/16" aka 70-8055

71-1620 B50 8 19/32"

The GP barrel was shorter than the round barrel to get the 11.4 comp ratio so the pushrods would have been shorter than the 8.25" of the round barrel. You have to be careful with the round barrel as some were GP length but had a spacer under the barrel to get the 9.4 comp ratio.

Re: Victor pushrod/rocker arm question [Re: AML] #784149 09/13/19 1:17 pm
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Thanks kommando do for all the info.
But my real question seems to have gotten lost:
both pushrods are the correct length, are straight and of equal length, yet the exhaust rocker tappet/pushrod clearance seems to have expanded. (I need to screw the tappet into the rocker arm much further)
Given that my previous pushrod got hammered/shortened I was worried something else (the exhaust rocker arm) also was damaged/bent.
It was the only thing I could think of and was eliciting thoughts before I pull the rocker box again.
Adam

Re: Victor pushrod/rocker arm question [Re: AML] #784150 09/13/19 1:23 pm
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kommando Online Content
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I can't answer that other than to say tappets do lose their stellite foot so you need to check for that by checking that both com followers are at the same height.

Re: Victor pushrod/rocker arm question [Re: AML] #784162 09/13/19 3:20 pm
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Many years ago, back in the 1970's, the exhaust push rod on my 441 Shooting Star got hammered to where the push rod jumped out of the tappet and rode on the engine case. The amazing thing is that the engine still ran (just barely) and I was able to limp the bike home. What I discovered was that the exhaust tappet's forward foot simply broke off. Somehow this caused the push rod to get hammered.

Apparently this is not that uncommon of a problem because on the BSA B50 engines the tappet's foot is made of thicker material. Maybe the B50 tappets can be fitted to the 441 engines.


Peter Joe

Re: Victor pushrod/rocker arm question [Re: AML] #784169 09/13/19 4:00 pm
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Quote
Maybe the B50 tappets can be fitted to the 441 engines.


Yes they can.

Re: Victor pushrod/rocker arm question [Re: AML] #784201 09/13/19 9:15 pm
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Hi Adam,
Have you checked the cam and followers?
Damaged or worn parts would punish the pushrod as the clearance increased

John

Re: Victor pushrod/rocker arm question [Re: AML] #784202 09/13/19 9:24 pm
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I’ll be having the inner timing cover off to check, hopefully in a day or two.
I’ll report back
Thanks to all
Adam

Re: Victor pushrod/rocker arm question [Re: chaterlea25] #784294 09/14/19 10:29 pm
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Originally Posted by chaterlea25
Hi Adam,
Have you checked the cam and followers?
Damaged or worn parts would punish the pushrod as the clearance increased

John


that would also be what i would do ......but first see if you can measure how much lift you are getting off the cam as it is.....


"There's the way it ought to be and there's the way it is" (Sgt Barnes)
Re: Victor pushrod/rocker arm question [Re: AML] #784393 09/15/19 10:36 pm
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I had a chance to open things up this morning. The cam is not worn (the lobes are of almost equal height) but it seems excessively pitted. The followers are ok-ish; they’re not too worn but I think I’m going t replace all.
But these parts don’t seem to be the cause of my problem.
[Linked Image from i.postimg.cc]
[Linked Image from i.postimg.cc]
[Linked Image from i.postimg.cc]
[Linked Image from i.postimg.cc]

Re: Victor pushrod/rocker arm question [Re: AML] #784445 09/16/19 7:51 am
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kommando Online Content
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Could be the angle but the followers look different lengths.

Re: Victor pushrod/rocker arm question [Re: AML] #784470 09/16/19 1:36 pm
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It’s just an optical illusion. They’re both of equal length (well, one is 0.2mm longer)

Re: Victor pushrod/rocker arm question [Re: AML] #784628 09/17/19 10:23 pm
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Dave Martin Offline
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Have you had a look at the rockers yet? has, one of the little ball end thingys (they probably have a proper name) that locate in the tops of the push rods been hammered up into the rocker arm by any chance?


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