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[sr2]

Hi Guys, some sagely advice from the brains trust please.

 

Standard 186 with stage 2 Yella Terra head and a Weber DCD. This is my trusty backup motor that lives in the car while I’ve got my performance motor in pieces on the work bench.

I was pulling the motor to replace the rear crank seal (as you do!) when I noticed oil in the inlet ports. I’m guessing the oil could only have come through the valve seals. The PCV valve is connected to the air filter (which is oil free).

 

The valve guides are in good condition and I had assembled the head with standard square section “O ring” valve seals from a kit I had lying around.

My question is; have I made the right diagnosis and if so are there any modern type seals available that would fit?   

 

Thanks, Simon.

 

 

 

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[76lxhatch]

If its only a small amount that seems very likely. It can be easy to accidentally damage the o-rings when installing springs, or sometimes they are just crap and will break and disappear.

 

If there's enough meat in the valve guide you can update the seals with a little machining; you can get cutters that locate in the valve guide and work pretty well so can be done on a drill press or potentially even by hand. This is a V8 head that has spring seats done also but you can do just the seal:

 

https://www.summitra...-material/steel