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Messages - JulianS

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Singles / Re: C15 cam and gearbox bushes
« on: 01 May, 2018, 22:33:05 »
I think it was non flanged for the inner bush for distributor model and flanged for side points models.

The very early ones could have been different.

Twins / Re: A65 threads
« on: 01 May, 2018, 22:22:17 »
The 4 bolts which clamp the bar to top yoke are 5/16 inch x 26 tpi cycle thread.

Twins / Re: New Find and project
« on: 01 May, 2018, 16:29:00 »
Looks like someone has modified the frame by welding/brazing an extra bracket just in front of the petrol tank.

Singles / Re: Oil pipe tap
« on: 01 May, 2018, 13:48:03 »
You need to split the crankcase to service the valve. Or it could be coming from the pump to crankcase joint as well.

Have you seen these valves which go in the oil feed line. The seller has been doing these for many years. Some owners like them others not. I used the A10 version for a few years until a new oil pump solved the problem.

Twins / Re: New Find and project
« on: 01 May, 2018, 10:26:19 »
Get a dating certificate from BSAOC which will tell you exactly what you have, whether frame and engine left factory together and when and to where it was despatched from the factory.

A65E prefixed engines were Spitfire Hornet in 1964 and 1965 season. Most were exported to the USA.

Below from 1964 West Coast USA catalogue.

Singles / Re: Oil return
« on: 30 April, 2018, 22:28:13 »
Leave enough room in the oil tank for the quantity of oil you use to prime the sump.

When the excess oil is cleared from the sump you will notice that the return oil isuing from the pipe in the tank tends to pulsate, the return gears in the pump have to be larger than the feed gears to keep the sump dry so the return will be oil and air.

Singles / Re: Oil return
« on: 30 April, 2018, 19:33:15 »
With your B40 just remove a rocker inspection cover and pour it in there, it will drain to the sump.

Singles / Re: Oil return
« on: 30 April, 2018, 17:24:29 »
Priming the sump gets oil to the rockers quicker than it would without.

Singles / Re: Oil return
« on: 30 April, 2018, 17:13:56 »
Put oil in the sump as well.

BSA actually recommended it for the twins on an oil change.

With my A10 I prime the sump then kick it over until oil is seen to return to the tank. Then start it and run it until I see aerated oil returning after the initial prime is cleared by the pump. That shows me that the feed side of the pump is also working.

Singles / Re: Oil return
« on: 30 April, 2018, 16:56:54 »
Kick it over a number of times before starting to allow the pump to feed the bigend.

Twins / Re: 1971 firebird
« on: 30 April, 2018, 08:58:35 »
The numbers started at 101 in June 1967 and continued to about 23000 in July 1969. Then reverted to 101 for 1970 season.

Those numbers included A50 Royal Star, A65 Spitfire Mk4 (for 1968), Firebird (for 1969), Thunderbolt and Lightning.

Below from 1969 export catalogue shows colours in the written description.

Twins / Re: 1971 firebird
« on: 29 April, 2018, 22:44:23 »
Below service sheet explains the numbers -15950 is simply the production number.

XC indicates December 1968 not 1968 - read it as Decemeber of the 1969 manufacturing season which ran August 1968 - September 1969.

Finding out the detail is not that- the numbers for 1969 season were a continuation from the 1968 season and  there was not a separate series for the different model of unit twins and the despatch book entries for that time did not usually include the colour however the brochures for UK and US market gives the Thunderbolt colour as a black and chrome tank with chrome mudguards with no alternative offered.

Singles / Re: Oil return tube
« on: 29 April, 2018, 13:09:55 »
Thanks for the photo has increased my knowledge.

Singles / Re: Oil return tube
« on: 29 April, 2018, 11:20:03 »
From photo looks like it could be wedged between pump and crankcase?

Singles / Re: Oil return tube
« on: 29 April, 2018, 09:45:36 »
The short pipe is not part of the original lubrication system and, without further dismantling, only the individual who fitted it could explain its purpose.

I think you need to investigate, a loose bit could cause a lot of damage to your engine.

Does it move if gently pulled or pushed?

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