[T3] cranks and clearances
topnotch at nycap.rr.com
Sun Aug 16 13:24:30 PDT 2020
Siamese twin engines? Gee Jim, Ive never heard that being done but....
I always fill the oil filters and crank for oil pressure before putting the
spark plugs in with new engines.
What do you use for assembly lube? I used to use white lith, then STP oil
treatment but Im inclined in just using oil with that build as that is what
Jake does with his.
YEa, I always just assembled things, although I ran into issues that way
with JC whitey parts the good quality stuff was fine, but nowadays? I
topnotch at nycap.rr.com
71 Squareback "Hothe"
65 Notchback "El Baja Rojo"
93 RX7 "Redstur"
13 Subaru Outback "Blendin"
From: type3-vwtype3.org [mailto:type3-vwtype3.org-bounces at lists.vwtype3.org]
On Behalf Of Jim Adney
Sent: Sunday, August 16, 2020 3:45 PM
To: type3 at vwtype3.org
Subject: Re: [T3] cranks and clearances
One thing that I've always done, that may or may not actually be helpful, is
burnish some MoS2 powder into all the bearing surfaces as I assemble an
engine. I use a Dow-Corning paste, Molycote G or U, and rub it into the
bearing surface with a finger. I think I may have rubbed some into the
bores, too. Anyplace that sees rubbing between a hard and soft surface.
I may still have some small tubes of this paste. A little goes a very long
I bought a tiny little can in the early '70s and that can is still half
To be fair, I don't know if this really helps, but MoS2 is an excellent
boundary layer lubricant that can help with startup.
Another thing I've done with a freshly rebuilt engine is to connect a small
tube between the engines in 2 cars by removing both oil pressure switches
and letting the running engine pump oil into the new engine, priming that
system under a bit of pressure. I'll underfill the oil in the new engine and
oil to the running engine as its level drops. Once the oil in the new engine
comes up to full, I'll try to start the new engine.
Once both engines are running, there should be minimal flow thru my tube,
so I can leave them both running for a 20 minute initial breakin of the new
engine, keeping an eye on the oil levels in both. Then both can be shut
down, the tube removed, and the oil pressure switches reinstalled.
The clearances you measured sounded fine to me, but I've never paid much
attention to clearances. Would there be somewhere you could take your
crank to make sure it is STRAIGHT? All the individual measurements could
be fine, but if the crank had a bit of bend to it, that would ruin
skilled crank person can easily straighten a bent crank. It's not as big a
as it might sound.
Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA
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