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by paul.jameson
Sat Aug 08, 2020 8:27 pm
Forum: Main Chat Forum
Topic: Frame Numbers
Replies: 8
Views: 527

Re: Frame Numbers

Spent 2 days largely on drilling out and re-tapping sheared off studs on the boiler of 0-8-0 Q6 63395 at Grosmont, NYMR.
by paul.jameson
Mon Aug 03, 2020 9:04 pm
Forum: Four stroke
Topic: MkI Square Four fine tuning and performance troubles
Replies: 9
Views: 270

Re: MkI Square Four fine tuning and performance troubles

Is the camshaft new or is it an old one? If old, uneven wear could lead to incorrect valve timing, as could badly worn cam followers.
by paul.jameson
Mon Aug 03, 2020 8:54 pm
Forum: Ariel Talk
Topic: First quick ride on the KH
Replies: 20
Views: 610

Re: First quick ride on the KH

The last time I saw Chris before he died was when he came round here to talk about brake lining material because "he had run out of adjustment". I revealed to him the mysteries of the fulcrum brake adjuster and when he left I assumed he would make use of them. Clearly, he didn't - but you ...
by paul.jameson
Mon Aug 03, 2020 8:48 pm
Forum: Ariel Talk
Topic: Engine rebuild - W/NG
Replies: 28
Views: 657

Re: Engine rebuild - W/NG

What that piston is - goodness alone knows.

I have sent you a PM.
by paul.jameson
Sun Aug 02, 2020 9:06 pm
Forum: Four stroke
Topic: Mk1 Sq 4 BLOWING HEAD GASKET
Replies: 16
Views: 387

Re: Mk1 Sq 4 BLOWING HEAD GASKET

Gui, I have spent a fair part of today pondering why your Square is a) less than smooth at higher revs and b) reluctant to go much above 60mph. If the valve timing is correct, then the problem has to be what I call a silly one. In the case of my 4G it was the tappet adjusters catching on the rocker ...
by paul.jameson
Sat Aug 01, 2020 8:39 pm
Forum: For sale/wanted - Bikes
Topic: FS: Ariel 1946 VH -SOLD-
Replies: 4
Views: 812

Re: FS: Ariel 1946 VH

Well, apart from the inner flat bit of the front brake dust cover rim being shiny instead of painted black......

Rant over.
by paul.jameson
Sat Aug 01, 2020 8:29 pm
Forum: Four stroke
Topic: VH crankcase joint
Replies: 9
Views: 346

Re: VH crankcase joint

Perhaps you could get that type of damage by knocking the case off the bench?

I think I would be considering replacement cases - which should not be too difficult to source.
by paul.jameson
Sat Aug 01, 2020 8:19 pm
Forum: Four stroke
Topic: Oil Leaks - Singles
Replies: 27
Views: 654

Re: Oil Leaks - Singles

My 1937 RH500 has the small bore original pump, an oil control ring on the piston, and I have fitted the later head so use the oil feed from the pressure side to the rockers. There are a number of AOMCC members who will confirm that, from time to time, the bike gets thrashed. It seems to thrive on t...
by paul.jameson
Sat Aug 01, 2020 8:13 pm
Forum: Four stroke
Topic: Mk1 Sq 4 BLOWING HEAD GASKET
Replies: 16
Views: 387

Re: Mk1 Sq 4 BLOWING HEAD GASKET

TJ,

My guess is that your studs are pulling where they go in to the head or cylinder. Its probably a long standing problem, rather than something you have caused. I can only suggest removing the studs to see if I am correct.

Gui,

Check your valve timing. The bike should go much better than that.
by paul.jameson
Fri Jul 31, 2020 6:41 pm
Forum: Four stroke
Topic: Iron 4G Crankshaft Nuts
Replies: 5
Views: 236

Re: Iron 4G Crankshaft Nuts

You have, no doubt, tightened the nuts by now but I thought it worth saying (and having it recorded because its on this Forum) that the cranks on pre-war Squares are so incredibly hard, on the surface at least, as to be brittle. Post war 4G cranks are much softer on the surface and less brittle as a...

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