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21
Technical Discussion Forum / Re: Timing
« Last post by 38lion on August 20, 2019, 05:35:25 PM »
Big thank you to John!!  Timing 180 degrees out and it's now a runner again.
22
EVENTS / Scottish Veteran and Vintage Gathering
« Last post by phutton on August 20, 2019, 12:53:52 PM »
Hi All,

We have been invited to take part in this interesting VMCC event which, as the name suggests is for up to 1930 machines. It is on 6-7 September. Short notice, I'm afraid, but well worth a look. Details on our website.

Paul
23
Technical Discussion Forum / Re: Timing
« Last post by singleminded on August 19, 2019, 08:17:13 PM »
Were both the valves closed,ie on compression stroke, when you timed it.
You've described exactly how to set up the timing.
Have you rechecked that the points still open at 1/2" btdc cos sometimes the mag shaft can slip when tightening the nut..I find that tightening the nut finger tight and then putting a larger socket over it so that the socket sits on the mag pinion and then tap the socket onto the pinion with a hammer ( not big thumps just a tap) will normally lock the pinion onto the taper and you get less slipping when the nut is fully tightened.  John
24
Technical Discussion Forum / Timing
« Last post by 38lion on August 19, 2019, 07:40:15 PM »
Trying to start my 1938 sv 600. I recently took of the oil pump side cover (internal pump) and have put it all back together and have timed it up as 1/2" before top dead centre, fully advanced, points just opening. It backfires!! and won't start. Have I done it wrong or are the settings different. It worked ok before work but it was such a long time ago that my father and I first did the timing. Any recommendations?
25
Technical Discussion Forum / Re: 1935 Model 8 Piston rings, advice please.
« Last post by Rick Parkington on August 18, 2019, 03:29:11 PM »
To add to Paul's sound advice, it is essential to make sure that the supports for the rocker box are level before beginning to tighten the bolts. Screw them in lightly and make sure the box is settled squarely on each, if necessary shimming with thin washers,  as this is another cause of the box breaking.
Cheers Rick
26
Technical Discussion Forum / Re: 1935 Model 8 Piston rings, advice please.
« Last post by Exstress on August 15, 2019, 05:35:32 PM »
Thank you Paul, that is precisely the reason I asked the question.  There is no substitute for experience.

If it's ok I will post some photos of the piston and barrel for your comments?

Regards, John
27
Technical Discussion Forum / Re: 1935 Model 8 Piston rings, advice please.
« Last post by phutton on August 15, 2019, 02:33:16 PM »
Hi John,

The beauty of the Sunbeam engine is that it is very simple, and the description of removing the head and barrel in the 1935 handbook covers most aspects. The only thing it doesn't mention, and this is very important, is that before you start to undo the bolts holding the rocker cover, you MUST ensure that the piston is on TDC. If you don't there is the real possibility that the load from the valve springs could cause the aluminium casting to crack. The same applies on re-assembly. As good engineering practice dictates, the bolts should be done up evenly.

There is no head gasket, as you say, but there is a gasket between the barrel and the crankcase.

Good luck with it!

P.


28
Technical Discussion Forum / 1935 Model 8 Piston rings, advice please.
« Last post by Exstress on August 15, 2019, 01:13:56 PM »
Hello, my 1935 Model 8 is smoking rather badly and I think its time to change the piston rings.

I have carried out this work on sixties bikes but have never had the Sunbeam engine apart.  Is it straightforward or is there anything I need to be aware of whilst dismantling please?

Also, once the head is off presumably there is no head gasket, just matching surface facings like the rest of the bike?

Any advice will be gratefully received.
Thanks, John
29
Parts Wanted / footrest arm
« Last post by hubii on August 13, 2019, 03:54:14 PM »
Hello,
I am looking for this type of footrest arm... can anybody help?
regards
Mathias
30
Parts Wanted / Re: Worn gearbox sprocket wanted
« Last post by michaelj on August 12, 2019, 10:59:07 PM »
I have a sprocket with ID 1'' and four keyways. Contact me and I will send you a picture beyondcaring@hotmail.com
Michael J. 1484
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