Re: [HSS] 1918 Super Six rod dipper

Unknown

davekeister@uswest.net wrote:

>

> I removed a .004 shim today on the nbr. 4 conn. rod bearing cap.

> I noticed that the oil dipper on that rod was different than the

> other five rods. It was not as wide and almost comes to a point at the

> bottom. The other type besides being wider are almost shaped like a

> rectangle. Does anyone know which type was correct for 1918 and if it

> is O.K. to mismatch them? I would guess that the pointed type that is

> now on my nbr. 4 rod would not dip as much oil?

> I'm putting the thing back together tomorrow, and hope that this will

> cure a slight rod knock that comes in at around 25 mph.

> Also, anyone know what the torque is on those rod caps. I can't find

> anything in my shop manual on that. I did noticed that the torque on

> the later 212 and 254 C. I. engines ( 1940) was around 45 lbs. per

> Motors manual. P.S. I had .006 clearance before removing the shim.

> Thanks for any info.

>

> Dave Keister Seattle

>

Dave, it won't make any difference to the amount of oil the bearing

receives. Think about it, the level of the oil in each trough is

regulated by the level the dipper comes down to, so if one dipper is a

little higher, then the level will be correspondingly higher in that

trough. Regarding torque, it is well nigh impossible to get the split

pin holes lined up with a pre-determined torque, so the drill is to

tighten up snug, then tighten further to line up the holes, whihc

probably amounts to around 50 lbes or so, which on the 7/16" bolt on

these early motors is okay. In mid '28 they changed the bolts to 3/8,

with directly babbitted rods instead of inserts. It is important that

the inserts in the earlier rods are held in securely, as if they are not

clamped by the shims they will be noisy, as the shell can move in the

rod. Ensure that the shell is slightly proud of the cap so that the

shims clamp it firmly in the rod. I do this by sweating a strip of shim

brass along the edge of the bottom shim, where it contacts the shell.

Geoff.