[T3] Tight exhaust valves
Bobsnotch at aol.com
Bobsnotch at aol.com
Fri Dec 27 06:05:58 PST 2013
In a message dated 12/26/2013 1:40:12 P.M. Eastern Standard Time,
jacob.schroeder at gmail.com writes:
I'm sad to hear (although not surprised based on my recent searches) that
MoFoCo heads are junk. Next time I have the valve covers off I can see
what MoFoCo started with so far as the head castings are concerned. I
thought they were rebuilt and were stamped with VW, but I'm not positive.
Regardless, it sounds like the valves could still be junk even if the
castings are good (or at least were good before MoFoCo got them).
Your MOFOCO heads are designed and cast in the USA, and that's where
they've always been made. They basically copied the VW head, but made some
changes to allow for them to be opened up, in both the breathing and size of the
cylinders. This was something that the original VW heads lacked (being
able to be opened up for larger engines without welding).
That said, I've got a complete MOFOCO engine in my 65 Notch, that was
built on an all aluminum case. The only issues I've ever had with it were vapor
locking the mechanical fuel pump, due to the extra heat the engine case
holds (probably something Keith doesn't think about with his T-4 engine). I've
since gone to an electric pump, and I've had no issues since. I've also
had no issues with valves getting tight (yes I watch them, and note how much
the gaps change) in the 7 1/2 years I've had this engine. However, I do
check them with every oil change, and since the engine is running dino oil,
and has only a strainer, I change it more often.
If you feel that the engine is running hot, then I'd look to make sure
that ALL of the cooling tin is in place first. That tin (while seeming small
in places) was there for a reason. VW didn't just add it to make life
difficult, they put it there because they felt it was needed. I'd also look to
see if the foam pad is in place above the oil cooler so that all of the
cooling air passes thru the oil cooler like it was designed to. Also, make sure
your thermostat is working correctly and that the flaps are opening. Make
sure there are no tears in the large cooling bellows, and that both clamps
are in place. I know some of this sounds simple, but you'd be surprised at
how many engines are out there with some or all of these little items
missing or defective (especially in California). :O
You might also want to double check your timing, as that has a direct
effect on engine heat (too much and it'll run hot, too little and it'll run
hot). If you have FI, then check the fuel pressure as well. These are all
little things that can effect engine temp.
Sorry, I got into a bit of a rant, but sometimes things just need to be
said that us "old guys" sometimes take for granted. ;-) I hope this helps.
Bob 65 Notch S w/Sunroof and IRS aka Krusty
64 T-34 Ghia aka Wolfie
71 Square-vert under construction
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