[xj-s] Heads and valve seats

[Mike Morrin <mikem@southern.co.nz>]

The HE heads and pistons for my E-type engine turned up, and I have pulled
the valve gear out, and am cleaning up the heads.

The A head appears not to have been touched, but the B head had gobs of
silicone around the tappet block and exhaust manifold gaskets.

The B head has centre punch marks around all of the valve seats.  It would
appear that there has been a dropped seat at some point.  One of the
pistons has a valve mark on it, but it is not clear whether that is a
result of the previous dropped seat, or the event that caused the final
demise of the engine (timing chain tensioner failure).  None of the valves
were tight in their guides, but I will check them for trueness.

The 6B inlet valve seat looks a little suspicious to me, as the carbon
deposits appear to be cracked around the periphery of the seat (depite the
centre punching) I will look at this more closely.

Of other note, the half moon seals on both heads were still pliable, and
not leaking.  The inlet valve stem seals on the A bank (original?) were
pliable, but the seals on the B bank (replaced?) were brittle.  Perhaps
these heads did not start life on the same engine?.

I find the metric bolts and nuts to be a pain, as it is necessary to think
twice before reaching for a spanner.

regards,

Mike Morrin
'75 XJ-S
'73 E-type
'85 Heads + pistons

---

• Prev by Date: Re: [xj-s] More lighting problems
• Next by Date: RE: [xj-s] Haynes for a 1991 XJ-S ...
• Prev by thread: [xj-s] Re: Radiator surround foam
• Next by thread: [xj-s] Heads and valve seats
• Index(es):
  • Main
  • Thread