Hi Peter
I think I saw yesterday that the ball diameter should be 5/16" or near as
damn it 8mm (7.937mm) so either would do, also if you look in the archive
for the list there is a posting I sent in some time back as a technical tip
on reseating the ball on the seat, if your car has had a 1/4" ball in it,
you would be well advised to do it, if you can't find it in the archive I
will try to find it, I cleared my outbox and put it in a zip file so not
easy to access immediately!
Graham.
2500PI MKII
Sprinted Dolomite
2000 MKI
Toledo
1300 Front Wheel Drive
http://members.tripod.co.uk/TriumphIW/index.html
----- Original Message -----
From: Nyberg Peter <Peter.Nyberg@lio.se>
To: <triumphs@autox.team.net>
Sent: Monday, June 12, 2000 9:37 PM
Subject: TR4 O/D op. valve ball size
>
> Hi list,
> May 23, 1998 I bought a ' 62 TR4 which hadn't been on the road since ' 74.
> The DPO had finnished step 1 in a total body off resto. i.e. body and
everything else detachable removed. There was plenty of rust, seized
> engine (work of the elements) and lots of missing parts (!?!). Some of the
parts that came with the car came from other cars. I had only seen
> TR4's on pictures so I didn't know what to look for.
> Anyway, May 23, 2000 the car passed the gov. imposed inspection with
flying
> colors. CO was 0.3 you're allowed 5.5 on a +30 year old car. Except for
> sand-
> blasting chassis & tub and fixing the frozen calipers, I've done
everything
> myself.
> It's definately not a concours winner - it's my first restoration and on a
> limited
> budget. And have I learnt some !
> Now the reason I address the list - I can't get the O/D to work. When
> reversing there's
> a grinding noise in the box and when going forward the rev counter (and
> engine) rev
> quicker than the wheels (no, no clutch slip - it's transmission slip). The
> solenoid is OK,
> I've tried several lift heights on the operating valve and yes, there's
oil
> under pressure
> when loosening the plug. However I measured the diameter of the valve (the
> rod that
> lifts the ball) and the diameter of the ball - they are both 1/4 ". The
> illustration in
> the workshop manual shows a ball seat and a ball that seems to be bigger
> than the seat.
> Anybody know the correct size of the ball?
> At the moment the valve, ball, plunger and spring is removed and that
> grinding noise
> when in reverse is gone. The rev counter, engine speed and car speed is
> syncronized.
> Sorry about this long message. If I ever come back I keep the next one
> shorter.
> Cheers,
> Peter Nyberg
> Linkoping, Sweden
> CT 17307 LO
>
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