|Posted on Wednesday, November 17, 2010 - 12:20 pm: ||
I have recently acquired a Stuart Turner single cylinder marine engine. I understand it is either a P5 or a P6, but don't know which. Can anyone tell me how to tell the difference. It does not have the customary brass plate nor any other markings, except the characters AT embossed on the block.
|Posted on Thursday, November 18, 2010 - 05:34 am: ||
Units can be P4/P5 variety with 4 head bolts
and P5 or P6 with 6 head bolts.
Pre-overhaul pistons on P5 were cast iron
Later P5 and all P6 ali piston.
I think all the P6 had a coil ignition and an amal carb. Coil ignition units would have a dynastart or starter and dynamo.
The AT is the block casting I guess and is on all.
There should be a brass plate on the gearbox to get an idea of the age.
P5 will have a mag.
Having said that there is a whole load of variations.
ie P5ME = p5 with electric start and magneto
P6d = P6 with dynastart
P5S = P5 with sailing clutch
Most ST units which had no gearbox had the mark "C" for clutch.
This is only my observations. Bearing in mind the update which could be done to the units by manufacturer, anything could have been changed on your unit.
|Posted on Thursday, November 18, 2010 - 12:26 pm: ||
Thanks mightily for taking the trouble to give me guidance. From what you say my engine is a P5 (6 head bolts and mag). It does have electric start, but I think that it is a later installation of a atandard starter motor. I suspect it may be a P5S but it has no gearbox nor clutch (so no brass plate). Any idea where I might get hold of a gear box or clutch assembly?
Once again, many thanks for your help.
Bernard Nix (email@example.com)