Porsche 356 Valve Seals - replacing them

[Poze123]

Hi all

Is it possible to replace Valve seals with the engine in the car / the cylinder head still on the engine?

I have compression of 150psi/10bar on 3 cylinders and 135/9.5 bat (approx.) on one cylinder. I get a grey smoke/oil smell from the exhaust and people have suggested that it could be valve seals (few dollars each).

Wasn't sure if it was possible to remove the rocker mech, and attach a tool to release the spring, then replace the seals?

Many thanks,
Paul
Dorset, UK.
_________________
1958 Beetle Deluxe
Chopper & Tamiya & Sinclair C5 collector
EX Cars- 53 T2 Barndoor, 53 T1 Standard Golde, 56 T1 Golde, 57 Oval, Mr Wizzo Wizard

[Erik G]

looks possible but not much room to work with. Not only do you need to remove the spring, you'll need to keep the valves closed. Rope down the spark plug hole will do that. The angle of the exhaust valve will make it difficult
_________________
Stop dead photo links! Post your photos to The Samba Gallery!

[Starbucket]

You make an adapter from an old sparkplug to fit an air hose and put piston tdc ready to fire (so both valve are closed) and bring air pressure up to 100 lb.s and remove valve springs and R&R seals. You will need to figure out how to compress springs to remove keepers.

[Danwvw]

I don't recall my 356 Heads having valve stem seals! Sounds like a patch. But how would they help with compression? Usually, oil smoke from the 356 engines is caused by worn out cylinders and rings. Maybe STP would help.
_________________
1960 Beetle And 1679cc DP W-100 & Dual Zeniths!

[Starbucket]