Author Topic: GB is not OK!  (Read 5419 times)

Offline edboy

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Re: GB is not OK!
« Reply #30 on: 24.05. 2018 21:15 »
hi greybeard, i have plenty of conrods but you will need new small end bushes. post me your address.
i risk opening a can of worms. but..... i think your cam and followers have ran too hot and starved of oil. i file a thin slot in each follower to allow oil to run down into the trougth. it seems to work.

Online Greybeard

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Re: GB is not OK!
« Reply #31 on: 24.05. 2018 21:34 »
hi greybeard, i have plenty of conrods but you will need new small end bushes. post me your address.
i risk opening a can of worms. but..... i think your cam and followers have ran too hot and starved of oil. i file a thin slot in each follower to allow oil to run down into the trougth. it seems to work.
Thanks Edboy, I'll bear that offer in mind.

Offline kiwipom

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Re: GB is not OK!
« Reply #32 on: 24.05. 2018 22:18 »
hi guys, GB glad you found the problem could have been a lot worst than a small end bush, good luck with the rebuild cheers,
nice pics.
A10.G.Flash(cafe racer)Honda 250 vtr. Yamaha Virago XV920.

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Offline KiwiGF

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Re: GB is not OK!
« Reply #33 on: 24.05. 2018 22:24 »
If I cannot get hold of a replacement small journal conrod, is it feasible to have the old one bored out and a new bush made up to fit?

Its almost standard procedure in NZ! Our bikes tend to have been used a lot during their lives *whistle* (aside from those bikes imported from the US).

A machine shop may also be able to expand a standard bush to suit the rod, and still be able to ream the ID to fit the pin. The expander tool can be a piece of bar with a short raised section of the required diameter. You just push the bush over it using a small press or vice etc.
New Zealand

1956 A10 Golden Flash EA7-168x, CA10 913x, left BSA together for Liverpool, 5th Dec 1955.

1949 B31 rigid “400cc hot rod” (favourite bike)

1949 C11 rigid, but why!!! (cos it was cheap)

1937 B21, missing parts so mission impossible?

1952 Armstrong Siddeley Whitley for rainy days (with wife).

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Offline chaterlea25

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Re: GB is not OK!
« Reply #34 on: 24.05. 2018 23:21 »
Hi GB,
What state is the timing side bush in?
I see you have an iron bodied oil pump so that is good
Check the PRV and make sure its good
The usual cause of cam wear is bad oil pressure
Glad to see its not a major disaster though  *smile*

John
1961 Super Rocket
1963 RGS (ongoing)

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Re: GB is not OK!
« Reply #35 on: 25.05. 2018 05:53 »
Hi GB,
What state is the timing side bush in?
I see you have an iron bodied oil pump so that is good
Check the PRV and make sure its good
The usual cause of cam wear is bad oil pressure
Glad to see its not a major disaster though  *smile*

John

I was knackered at the end of play yesterday so I just had a quick look at bearings. The timing side bush looks good. Before I split the cases I applied leverage to the shaft to see if it visibly lifted in the bush. All that was visible was a slight squeeze of oil. I also tried a pair of internal callipers, (see below) in the empty bush and did not feel any difference in contact as I spun the callipers around.

The PRV is a plunger type that came from SRM so should be good. That pump was described as high capacity and the return flow is very good.

The camshaft I bought had been reprofiled from an old one so was smaller than standard; my tappet adjusters had to be screwed right in to get correct clearances. The seller claimed the shaft had been rehardened, but who knows how good that hardening was? When I last adjusted the tappets I did set them a bit closer than recommended as the engine has always been rattly when hot. It's possible that I left them too tight.

Offline Triton Thrasher

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Re: GB is not OK!
« Reply #36 on: 25.05. 2018 06:30 »
Check the relief valve plunger and bore for smooth movement and marks which might indicate that they have stuck together at any time.

Offline coater87

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Re: GB is not OK!
« Reply #37 on: 25.05. 2018 11:32 »
I always figure a good press fit is .001 per inch of diameter.

 Under an inch is always. 001+ when I make something.

 Lee
Central Wisconsin in the U.S.

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Re: GB is not OK!
« Reply #38 on: 25.05. 2018 11:35 »
I've stripped and cleaned the PRV. It looks good as new.

Timing side bush:
I set my internal callipers to lightly touch inside the timing side bush. As I said yesterday the bush feels consistent all around. I measured the callipers with my brand new 1 to 2" micrometer and found a measurement of 1.3750". The crankshaft journal measures 1.3732". I make the difference 1.8 Thou.
I did not detect any appreciable ovality in the crank journal.

Big end journals, measured North to South and West to East:
Timing side, N/S, 1.4495", W/E, 1.4492"
Drive side, N/S, 1.4498", W/E, 1.4498"

What do you think about all this?

Online Greybeard

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Re: GB is not OK!
« Reply #39 on: 25.05. 2018 12:02 »
I always figure a good press fit is .001 per inch of diameter.

 Under an inch is always. 001+ when I make something.
Is this referring to getting my Conrod rebushed?

Offline KiwiGF

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Re: GB is not OK!
« Reply #40 on: 25.05. 2018 12:22 »
I've stripped and cleaned the PRV. It looks good as new.

Timing side bush:
I set my internal callipers to lightly touch inside the timing side bush. As I said yesterday the bush feels consistent all around. I measured the callipers with my brand new 1 to 2" micrometer and found a measurement of 1.3750". The crankshaft journal measures 1.3732". I make the difference 1.8 Thou.
I did not detect any appreciable ovality in the crank journal.

Big end journals, measured North to South and West to East:
Timing side, N/S, 1.4495", W/E, 1.4492"
Drive side, N/S, 1.4498", W/E, 1.4498"

What do you think about all this?

You are getting on quickly! Those crank measurements suggest new shells needed, at most to me, the main journal has slightly more clearance than I would like but I think it’s ok, given the engine is going back together as a part worn one anyway, just my opinion!
New Zealand

1956 A10 Golden Flash EA7-168x, CA10 913x, left BSA together for Liverpool, 5th Dec 1955.

1949 B31 rigid “400cc hot rod” (favourite bike)

1949 C11 rigid, but why!!! (cos it was cheap)

1937 B21, missing parts so mission impossible?

1952 Armstrong Siddeley Whitley for rainy days (with wife).

GL1800 Goldwing not sure why, maybe cos it always starts

Offline terryg

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Re: GB is not OK!
« Reply #41 on: 25.05. 2018 12:30 »
Good progress indeed GB. Very pleased to see you've caught things before more major damage. Well done.
Looks like it won't be long before you're riding again at the rate you're going.
Terry
'57 'SR', '59 SR, '63 RGS

Online RichardL

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Re: GB is not OK!
« Reply #42 on: 25.05. 2018 12:40 »
GB,

I meant to ask, were there any signs of gudgeon pins spinning in the pistons? I should add, "...leading to evident wear in the pistons?"

Richard L.
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Re: GB is not OK!
« Reply #43 on: 25.05. 2018 12:46 »
I meant to ask, were there any signs of gudgeon pins spinning in the pistons?
Hmm, haven't checked for that, yet. I think they are probably OK though as I had to use the hot air gun on the pistons to get the pins out.

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Re: GB is not OK!
« Reply #44 on: 25.05. 2018 13:03 »
...Those crank measurements suggest new shells needed...
I was planning to get new shells.