Crank Case Venting...

[Snuffy]

Hey guys,

I'm fiddling with my engine while I wait for a new flywheel to come in and I'm in need of some advice:

Working with a 4BT, stock hood mounted canister on the truck... Can I just run a vent line from the crankcase to the intake for the canister air cleaner??? This is how the stock engine was configured, but I didn't know if it would be a problem with a diesel.

As it sits, the crankcase vents straight to the bottom of the engine via a hose. Looking to make it water-tight for fording without a valve.

Problems, thoughts, suggestions...?????

Thanks,
Snuffy

[Barrman]

The vents on diesels are referred to as "slobber tubes" more than vents. The Dueces just had them open and hanging down by the front axle. The Multifuel fording kit routes the slobber tube up next to the air intake with a cap on the vent tube.

If you are thinking of using the engine blowby to seal up or pressurize the rest of the parts on the truck like a stock M715, don't. The M35's use air from the air compressor to do it. Actually, the M35's have vents/caps on the axles, tcase and trans that are supposed to vent normally and then close to keep water out. Only the engine and clutch area get pressurized on the M35's.

I would recommend just running lines like on the stock M715 from the parts to the air filter, put your slobber tube near the air filter with a cap on it to keep rain out and forget about anything else unless you plan on wearing scuba gear yourself. Then, you really need to think about a different truck John.

[Snuffy]

Works for me!!! Thanks, Tim.

[old dog]

my cranks case hose is in poor shape, need to buy a new one...anybody know where to buy......thanks

[Don Cavey]

my cranks case hose is in poor shape, need to buy a new one...anybody know where to buy......thanks

Which setup, early or late? If your air cleaner sits on top of the carburetor, I don't know of a source for the large rubber hose. However if it is the one that is a canister, mounted to the hood (late version, 1969 or so) you do see them out there on the auction sites and try the usual vendors.