Engine case ?

[Aquabuggy]

What do these numbers stamped on top of the case stand for?

And what is this wire for?

Heres the case number.


Thanks

[David O']

First pic.......probably means that the case is bored to .020 over size on the main.
Second pic......factory numbers to make sure the block halves match.
Third pic......engine is a 50 hp block!

[Aquabuggy]

Thanks David,
Is 20 over a bad thing?
In the second pic there are 2 wires going to something. Do you know what it is?

[blackthree4me]

If I understand this corret the .020 is the amount cut off the bearing bore.
.040 is the most you can get bearings up to
most walk at anything over .010
but they are getting harder to find with a .010
all of mine have had .020 or larger
I did a post awhile back about those #s

http://www.aircooledtech.com/bearing_surfaces/

its verinformative but as david says its not the gospel.
blackthree4me

[Aquabuggy]

Thanks Steve, The link is very helpful, after reading it and looking over the case I think this case will be usable.

[Bryan Porter]

Don't bet any money but I think those wires are for fuel injection but like I said no bets.

[MURZ]

Don't bet any money but I think those wires are for fuel injection but like I said no bets.

I'll bet...... Bryan you are right. It is for fuel inj.

[blackthree4me]

One last thing that made mine scrap awhile back was,
to bolt it together.
torque it down.
take a look thru the bore with a flash light from the other end.
if you can see light thru any of the split lines its bad!
the reason is the mains are oiled from the outside in
(there is a slot in the OD of the bearing not the ID)
once the oil gets to the split line is just squirts out the the split and never makes it to the hole to lube the crank or not enough to provide adiquit
also contributing to low oil pressure.
suposedly there are some bearings that have the grove on the ID
so solve that issue but pretty hard to find.
just what I learned awhile back.
blackthree4me

[Duner]

Chris,

Where is the location of the first pic? I'm checking my 1970 case and can not find any numbers or they are to pitted to see.

And I agree with the group that the wires are for the fuel injection it would most likely be the crankshaft position sensor used to time the FI system, it should not matter if you are doing a carbed motor.

[Aquabuggy]

Gary,
The numbers are stamped in the case on the top where the two halves come together and near the oil cooler.
If your case has no numbers stamped there or near the oil cooler its probably got standard size bearings (the case has never been machined) thats good!

[bbcountach]

1-4-3-2 is the firing order of the cylinders.
Thats just about everything that I know.