Author Topic: wheres my little end ?  (Read 3243 times)

Offline mrshells

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wheres my little end ?
« on: 10.05. 2009 00:18 »
Been out for a ride today and she developed a knocking
almost like a tappet rattle
which got worse !
much worse !
when I got her home  I found after removing the barrels
the little end had gone on the left hand cylinder
Really gone !
As in not there!!!
like some one stole it or forgot to put one in
I know it was ther when I built the motor last year ???? *conf*

I think i may have to wash it from the sump

Offline LJ.

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Re: wheres my little end ?
« Reply #1 on: 10.05. 2009 09:07 »
OH no! thats bad news... Hope you managed to get it all sorted out soon. Sorry I did not get to the Wolds run last week, I was away at an Old Pupils reunion lunch with the Missus down near Gatwick, I hear it was a great ride.  *sad2*
Ride Safely Lads! LJ.
**********************
1940 BSA M20 500cc Girder/Rigid- (SOLD)
1947 BSA M21 600cc Girder/Rigid-Green
1949 BSA A7   500cc Girder/Plunger Star Twin-(SOLD)
1953 BSA B33  500cc Teles/Plunger-Maroon
1961 BSA A10  650cc Golden Flash-Blue
1961 BSA A10  650cc Golden Flash-Red

Offline rocket man

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Re: wheres my little end ?
« Reply #2 on: 10.05. 2009 14:10 »
ive never heard ove a little end wearing out in such a short time
was it a pattern one or an original carnt be too carefull these days
there are a lot ove substanderd parts out there

Online shabashow

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Re: wheres my little end ?
« Reply #3 on: 10.05. 2009 15:36 »
I just finished rebuilding mine after the right hand little end broke into a thousand pieces. That was about 350 miles after its first rebuild! Some of it was still wedged between the conrod and piston.
The oil was a fine suspension of golden flakes, and there were a few scores on the crank. They  polished out ok. Everything needed stripping and cleaning.
Should have replaced the old one at that time, but, you live and learn.
If yours broke up, there should be pieces everywhere, especially on the screen filter in the sump.
Good luck in finding it!
John

Offline A10Boy

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Re: wheres my little end ?
« Reply #4 on: 10.05. 2009 19:54 »
Oh dear, thats bad news. If it broke up, there is going to be bits of it throughout the oil system. You will obviously need to strip the motor and clean it out. Bits of it are likely to be in the oil tank, pump, sludge trap and pressure release valve too.

Good luck.
Regards

Andy

1958 Super Rocket
Plus
1974 Kawasaki Z1a
Yam XJR 1300

Offline mrshells

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Re: wheres my little end ?
« Reply #5 on: 10.05. 2009 22:51 »
theres bits of bearing everywhere
my No 1 concern is that the rod isnt oval
dont know how long its been in there but it was there when i bought it 1500 miles ago
will order a new bush tomorrow and start stripping for a clean up
Summer is allmost upon us and I need to be riding it not looking at a pile of bits !!!

Offline rocket man

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Re: wheres my little end ?
« Reply #6 on: 11.05. 2009 21:27 »
good luck mate

Offline a10gf

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Re: wheres my little end ?
« Reply #7 on: 11.05. 2009 21:31 »
Quote
I need to be riding it not looking at a pile of bits !!!

I know the feeling. Best wishes.

A10 GF '53 My A10 website
"Success only gets you a ticket to a much more difficult task"

Online RichardL

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Re: wheres my little end ?
« Reply #8 on: 11.05. 2009 21:34 »
If it were me, I'd replace both bushes while I was at it. You might also want to wait on that parts order until it's apart, you are bound to need more.

I think you need to inspect and plastigage the big-end bearings.
Plan on signing up for the world-wide 2020 DISTINGUISHED GENTLEMAN'S RIDEon September 27, 2020 (if it's not cancelled and we are free to move about by then). Watch website at https://www.gentlemansride.com for details.

Online RichardL

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Re: wheres my little end ?
« Reply #9 on: 11.05. 2009 22:48 »
OK, I'm getting that "obsessed with the issue" feeling.

Why the left side and why at all? Obviously, oil starvation. But the left side has this little hole in the hollow of the rod that, some say, squirts oil on the side wall of the cyclinder to add lubrication on the left side. However, I think the hole is there, at least mostly, for allowing oil to flow through the crankshaft journal, for both big-end bearings, without being held back by air pressure in the crank or slow flow through those bearings. So, say it squirts on the cylinder wall and is scraped into the inside of the piston where it drools onto the gudgeon pin and lubricates the small end. Other lubrication mechanisms are splash and mist. Anyway, I am not coming to a conclusion here. I just wanted to get the ball rolling, discussion-wise, to be sure there is a diagnosis, such that another occurance is not in the offing. Minimally, I think, be sure the little hole is there and it's clear.

I look forward to hearing from you and others with hypotheses as to why the left and why at all?

Richard L. 
Plan on signing up for the world-wide 2020 DISTINGUISHED GENTLEMAN'S RIDEon September 27, 2020 (if it's not cancelled and we are free to move about by then). Watch website at https://www.gentlemansride.com for details.

Online bsa-bill

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Re: wheres my little end ?
« Reply #10 on: 12.05. 2009 09:24 »
Now then Richard , if the hole was there to allow oil flow it would not matter which way the hole faced.
It is written that it should face inward to the centre of the barrels, this would make sense in as much as there were apparently problems with the left side overheating and it would surely be the centre of the barrel that overheated?.

There now let debate continue.

All the best - Bill
All the best - Bill
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1959 Rocket Gold Flash - blinged and tarted up  would have seizure if taken to  Tesco

Offline Dynamo Regulators Mike

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Re: wheres my little end ?
« Reply #11 on: 12.05. 2009 09:34 »
Richard, funny how many threads, especially of late, relate to oil system faults or weaknesses.

One thought is that the LH cylinder, even with the hole in the rod still gets less oil than the timing side piston which benefits from inevitable leakage around the timing side bush at high pressure (if you are lucky). It has been asserted that the LH big end gets less oil than the RH as it is further from the pump. But the symmetrical feed from the sludge trap tube makes a nonsense of this.
Looking forward to other insights . . . .
Mike Hutchings
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Director, DRL www.dynamoregulators.com

Online RichardL

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Re: wheres my little end ?
« Reply #12 on: 12.05. 2009 13:36 »
Interestingly, billet rods from MAP (also sold by SRM) do not include the little hole, as they say "don't need it." (Loosely quoted.) I couldn't live with the idea that the likes of Roland Pike probably thought the hole was needed, so I drilled my own.

Also, the billet rods do not have bronze bushes. The gudgeon rides on the aluminum.

Richard L.
Plan on signing up for the world-wide 2020 DISTINGUISHED GENTLEMAN'S RIDEon September 27, 2020 (if it's not cancelled and we are free to move about by then). Watch website at https://www.gentlemansride.com for details.

Offline beezalex

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Re: wheres my little end ?
« Reply #13 on: 12.05. 2009 14:21 »
I'm thinking that the "High performance" rods (carrillo rods don't have holes either) don't have the oil hole because it creates a stress point and likely starting point for cracks.  A high-revving motor should also have enough spray to keep the DS bearing and cylinder wall properly lubricated.
Alex

Too many BSA's


Online RichardL

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Re: wheres my little end ?
« Reply #14 on: 12.05. 2009 15:10 »
Alex,

I think that means I did the right thing in drilling the hole, as I've no intention of revving to racing speeds.

Richard L.
Plan on signing up for the world-wide 2020 DISTINGUISHED GENTLEMAN'S RIDEon September 27, 2020 (if it's not cancelled and we are free to move about by then). Watch website at https://www.gentlemansride.com for details.