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Dave

2024-06-11, 20:02:05
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Dave

2024-06-08, 18:30:04
For Sale
xman has two very nice 1950's machines available - a green 1950 mk4 and black 1951 mk5 - both in good condition and running well.

Dave

2024-06-07, 02:13:36

Dave

2024-06-03, 08:23:05
For Sale
Duncan has just listed his green and cream 1957 Dragonfly for sale with spares and documents.

Dave

2024-06-02, 08:34:05
Parts avalable
alistair still has parts available - barrels, carburettor, castings - see all listings.


Dave

2024-06-01, 18:33:27

Dave

2024-05-28, 00:09:46
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T6 engine

Started by ManfrerdSt, 10 May 2017 at 07:56

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ManfrerdSt

More questions!

Can someone give me a good copy from the page in the Manual 1930 T6 "Diagram of the oiling system, Arrows showing passage of oil"? My copy is very bad.

Regards
     Manfred

graeme

Hi Manfred

That screw should have a little rod in it that goes up with oil pressure. There must be a picture on this site of an S6 or T6 that shows this.

Cheers, Graeme

ManfrerdSt

The rod can be seen to the left of the ignition drive

Regards
     Manfred


Bert

The rod that Graeme refers to is the one on the top at the rear which indicates oil pressure and looks like you have in place. Oil flows from the pump past a piston on the end of the rod, forcing it upwards.
The bolt that you have indicated is a mystery to me. Someone told me it was a relic of the previous years model, possibly for a valve lifter. Mine is blanked off like yours Manfred. 

eddie

#4
Sorry Graeme,
                       The plug with the oil indicator is the one to the left of the mag pinion (you can see the rod going into the top of the vertical oil gallery). The blanking plug fills the hole for the cable of the optional exhaust lifter fitted to some of the early 750's.

Manfred,
             The oiling system on the S6/T6 is very simple - the oil pump pushes the oil up the vertical oil gallery, from where some is fed to the 2 cam spindles (via the brass 'Y' piece), the remainder is then fed to the timing side main bearing bush and into the crankshaft to lubricate the big ends. Any excess continues up the vertical gallery to lift the indicator rod and then flows out of a spill port in the side of the gallery (to return to the sump)(the weight of the indicator rod controls the oil pressure!). The rest of the engine is just 'splash' lubricated.

Regards,
               Eddie.

graeme

Woops! I don't know what I was thinking, I know where the pressure rod is meant to be  :oops:

Doug



A higher resolution image can be found here: Maximum resolution

-Doug

Doug

Oh, and the mystery plug is I believe the point the Bowden cable enters for the exhaust valve lifter used on the 750cc engines (Mastiff). On the 600 and 500cc engines it was blanked-off and the exhaust valve lift mechanism not fitted.

-Doug

ManfrerdSt

Hello Doug

Thanks for the good copy!
The screw there was starting from 1929 I believe, the 750er only starting from 1932.
or am I wrong?

Regards
     Manfred


Doug

Manfred,

Correct.

I think Douglas must have designed a provision for an exhaust valve lifter from the beginning in late 1929, but for whatever reason did not include one until the 1932 Mastiff model.

-Doug