Author Topic: What a rotten way to spend Sunday afternoon  (Read 1657 times)

Offline a101960

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What a rotten way to spend Sunday afternoon
« on: 05.05. 2013 19:22 »
Normally I a man of infinite patience. But today my patience has been sorely tried. Bl**dy A10 **!!!********!! Anybody care to guess what it is I have wasted a whole afternoon doing? The Jobs done now, but oh how I hate that task. I suspect that many of you have experience a great deal of frustration doing this job. Some people claim to able to do it in ten minutes. For me it has never been less than an hour, and today was just plain tiresome
John

Online Duncan R

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Re: What a rotten way to spend Sunday afternoon
« Reply #1 on: 05.05. 2013 19:51 »
Rocker Box ?
Anglo - Indian A7SS (Actually is a 650)
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Offline tombeau

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Re: What a rotten way to spend Sunday afternoon
« Reply #2 on: 05.05. 2013 19:52 »
Push rods or pistons into the barrel?

Offline MG

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Re: What a rotten way to spend Sunday afternoon
« Reply #3 on: 05.05. 2013 20:09 »
Cleaning and polishing?   *lol*
1955 A7 Shooting Star
1956 A10 Golden Flash
1961 Matchless G12 CSR

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Offline a10gf

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Re: What a rotten way to spend Sunday afternoon
« Reply #4 on: 05.05. 2013 20:21 »
Fixing a flat ?

A10 GF '53 My A10 website
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Offline Beezageezauk

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Re: What a rotten way to spend Sunday afternoon
« Reply #5 on: 05.05. 2013 20:55 »
Yeah,  I'll go with changing a tyre!!

Beezageezauk

Offline Briz

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Re: What a rotten way to spend Sunday afternoon
« Reply #6 on: 05.05. 2013 21:05 »
Ignition timing? *eek*

Online metalflake11

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Re: What a rotten way to spend Sunday afternoon
« Reply #7 on: 05.05. 2013 21:24 »
It's got to be the pushrod locating problem!
Brazing rod, torch and the rocker box about 1/2" from seated works for me.

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England

Online morris

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Re: What a rotten way to spend Sunday afternoon
« Reply #8 on: 05.05. 2013 21:57 »
trying to get it started? *smile*
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Offline a101960

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Re: What a rotten way to spend Sunday afternoon
« Reply #9 on: 05.05. 2013 22:09 »
Rocker cover and pushrods. Unbelievable! I had the cover on and of so many times that I have lost count. Every time three of the push rods located correctly and one was dislodged, and always a different one to the time before. I used all methods The comb, hooked wire, and thin screw driver. Eventually the comb triumphed. I have to marvel at how it was done on the production line. Clearly a job you were given if you had upset the foreman. It really is an awful design. I agree timing is also a rotten job but that is not an exclusive BSA design problem. Any magneto equiped bike is problematic, but the A10 pushrod/ rocker cover is the spawn of the devil. Ah well tomorrow is another day. Who knows I might even get to go out for a ride.

John

Offline Briz

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Re: What a rotten way to spend Sunday afternoon
« Reply #10 on: 05.05. 2013 23:07 »
Comb never really worked for me. Wipes all the hylomar off the gasket for one thing!
I guess if you were doing it all day every day you'd get a knack for it.
All the A10s I've built except the first, I've machined a hole in the top, or (on my last one) used an Ariel huntmaster rocker box, which has a hole.

Offline muskrat

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Re: What a rotten way to spend Sunday afternoon
« Reply #11 on: 06.05. 2013 01:06 »
Next Olympic sport or a fun game at the next A7/10 BBQ. Would have to start early am and have flood light back up. ;)
Cheers
'51 A7 plunger, '57 A7SS now A10CR, '76 XT500, '77 AG175 '83 CB1100F, '81 CB900F project.
Australia
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Offline fido

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Re: What a rotten way to spend Sunday afternoon
« Reply #12 on: 06.05. 2013 07:22 »
It is a very long time ago but I don't remember having a problem doing the pushrods on my A7SS. The job I hate the most is doing the ignition timing and that was just as bad on the A7SS, the B31 and the A7 longstroke. Actually it is a bit worse on the longstroke as it is auto advance. On the other 2 if it was a bit too advanced you could retard it on the lever.

Online orabanda

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Re: What a rotten way to spend Sunday afternoon
« Reply #13 on: 06.05. 2013 07:56 »
This job is a bit like sex; the more you do it, the better you get at it.

I have also had the occassional difficult experience, but generally these days it seems to only take 10 - 15 minutes.

One tip is to turn the engine over, so the exhaust cam lobes are at the bottom i.e; the two longest pushrods (exhaust) are level at the bottom of the stroke.

Check that the two studs hanging down at the front of the rocker box (one per exhaust valve), are no longer than necessary; just enough thread to get washer & nut on.

Richard

Online KiwiGF

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Re: What a rotten way to spend Sunday afternoon
« Reply #14 on: 06.05. 2013 08:54 »
Push rods engagement tips gleened from this site........back off all the rocker adjusters, fit elastic bands stretched over the rocker box cover to hold the rockers adjusters up and hence cause downward pressure on the rods. Turn the engine to make sure exhaust valves are both shut. FIt cover and push lightly down until all there is (elastic band) pressure on all the  rockers. One inlet valve will be open and the cover will not go down fully on that corner. Use a ruler or piece of wire to move the inlet rods so they engage propely in the rockers, feel they are engaged with your finger. Exhaust rods should almost always engage without help. When all rods are engaged do the rocker box nuts up a bit at a time double checking nothing is being forced/bent by making sure the rockers are free to move at all times. It can help to do the adjusters up  finger tight before tightening the cover nuts. Above applies to s/a engine. Sometimes takes 5 mins sometimes 15mins!
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Last had an A10 in 1976, in 2011 it was time for my 2nd one.

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

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