GMark1

Anyone know if you can replace this check valve with a hollow banjo bolt that holds the oil line to tensioner like 1986 and later model cars have, 1985 and 86 have same tensioner but no check valve on 86

zekgb

FYI there is no check valve on my 85.

GregBBRD

Porsche didn't engineer and build that check valve because they ran out of hollow banjo bolts.

I'm having a tough time imagining why you would even be questioning this.....put it back the way it was....there is zero downside.

davek9

How do the plastic shoes look?
There were issues with the 85/86 tensioners too, causing Tappet noise (low oil pressure).
I always replace them w/ the improved S4 design, at least you can replace the shoes also.

edit: does yours have the disc or the cup at the top of the spring (it's inside the tube), will need to tap in on the bench for it to fall out, early ones had a disc, then were updated to the cup.
IIRC there was a tech bulletin on it.

can be seen on the top of the sping

Randy V

Sounds like a new 'improvement' is needed by Porken.

davek9

Hi Randy, what we really need is a supply of the Oil feed tubes for the S4 tensioners to fit onto an S3 head.
Porsche did make them at one time and they were fitted to later model 86.5's, however they are NLA