Use a cotton rope, not plastic! Stuffs in easier and any frayed pieces
left in the cylinder will burn off.
Paul
Ohio
-----Original Message-----
From: datsun-roadsters-bounces@autox.team.net
[mailto:datsun-roadsters-bounces@autox.team.net] On Behalf Of Graeme
Suckling
Sent: Friday, January 28, 2011 10:13 PM
To: datsun-roadsters@autox.team.net
Subject: Re: [Roadsters] valve seals
On 29/01/2011 12:44 PM, Larry Braddock wrote:
> Anyone know if I'm able to replace valve stem seals on my 66 1600 without
> taking the head off?
>
> Larry
> ________________________________________
>
Sure you can!
There are several methods of keeping the valves in the closed position
while you do the job.
I have never used, it but apparently the Indian Rope Trick is the
cheapest and safest method I believe.
You place the piston of the relevant cylinder at TDC compression stroke.
Piston at top of stroke, both valves closed.
Give the valve tops a bit of a tap with a hammer to free up the retainers.
Then you feed into the spark plug hole a length of rope or cord so that
it snakes around and fills the combustion chamber, thus physically
preventing the valves from dropping into the cylinder.
You then use a lever type valve spring compressor to release the
retainers and remove the springs.
R & R the seals then re-assemble the valves for that cylinder.
Repeat for each cylinder.
The advantage of this method is that the valves are jammed shut
positively by the cord.
They may drop slightly but can easily be retrieved by hand or jamming
more cord into the chamber.
You can also pressurize the cylinder with compressed air but if the
pressure leaks away for any reason, the valves will drop.
I suppose you could continuously pressurize the cylinder but it wouldn't
be as secure as the rope method.
One little fart and game over:-!
--
Regards,
Graeme Suckling
1965 SP310 Datsun Sports
1971 P510 Datsun 1600
1972 PL510 Datsun 1600 LHD
1973 HS30 Datsun 240Z
1984 B120 Datsun 1200 utility
1993 ECR33 Skyline GTS25t
http://tinyurl.com/6n5aza
Adelaide
South Australia.
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