Porsche
944 Cylinder Head Service.
This service came about towards
the middle of 2008. I figured with the
Number of 944 drivers out there
that often have a timing belt failure, there was
A need for a shop to supply
quality rebuilt cylinder heads at an affordable price.
Now, instead of tracking down a
used head, buying it, having it delivered, taking it to a machine shop,
Paying them to clean, resurface
and replace parts… Why not have them already
Rebuilt, in stock, and ready to
go?
That’s exactly what we have done!
Here is
the process:
-
BENMS obtains used cylinder heads (usually with bent valves from a
t-belt incident)
-
The head is torn down and steam washed to be inspected.
-
Any carbon not removed by the steam wash is soda blasted off at
60psi.
-
Any remaining gasket material is removed and surfaces are
polished.
-
Warped heads are DISCARDED! We do not mill down warped heads!
-
Every head is measured for trueness of deck, and all valve guides
are measured.
-
The head is then checked for cracks with a zyglo process
-
If the guides are worn, they are replaced.
-
Each valve that “looks straight” is hand rolled in a lathe with a
run-out gauge to be sure.
-
New valve seals are installed.
-
Bent valves are replaced, and all valves are lapped in before
being seated.
-
Some heads are prepared with light intake polishing, others have
provisions for steam vents, most are kept stock.
-
Now, when someone needs a rebuilt head, we have them ready to go
for less than you may think!
We currently stock 944 & 951
heads along with 944S & S2 heads.
We will also rebuild your damaged
head, contact us for details and pricing!
For information please email nick@benms.com.
Some pics of the process:
Heads are received, and teardown
begins.
Combustion chamber after steam
wash and soda blast
Zyglo testing is used to locate
any cracks, resulting in an unusable head.
Valve guides being measured
Intake port after light polishing
New seals are installed
Valve run-out checked by hand in
lathe
Valves are lapped in, then
springs and keepers installed
Finally springs are given a coat
of WD40 and are ready to go!