leaks oil....a lot.

Quote:

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Originally Posted by bee utey

The tee piece and restrictor jet are important to prevent fumes being drawn through the IAC (stepper) motor, eventually clagging it up. Good thing you got an o-ring for the dissy, I have seen some people cut paper gaskets for under the dissy too, similar to old Holden red motors.

You can make your own tee, like:

http://www.aulro.com/afvb/attachment...9-dsc03186.jpg

remembering the restrictor jet to the manifold is important.

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Well, after a few weeks with minimal leaking it came back again during a trip away :mad:. 2.5L of oil from Gosford to Tamworth....at least the gearbox, transfer and rear diff is now well rust proofed :p.

Anyway, the leak was mainly from the breather in the LH rocker cover. Cleaned the throttle body and the orifice just forward of the butterfly was blocked, as was the tube fitting for the hose that goes to the purge canister. Mine didn't have the tee as above (its a 3.5 flapper) so i raided one from the 'spare' 3.5 hotwire D1 and fitted it. The orifice in it was 7/64" (2.75mm) drill size. It was plumbed in closer to the flame trap, into a spare plug on the RH side of the inlet (between brake vac and extra air valve fittings).

Now i seem to have excessive vacum in the crankcase at idle. When you remove the oil filler cap with the engine running, there is noticable suction on the cap, and you can hear the valley gasket 'pop' when you remove it. With the cap on, you can also hear the gasket pop when you shut the engine off.

Should i reduce the orifice size to 1.5mm or just remove it compleatly.

Cheers
Rick

If the tee is installed correctly fresh air should travel easily into the engine via the large vent hose to the throttle body. Then there is no more vacuum than with a simple breather. EFI engines have an inlet filter-breather on the back of the passenger side rocker cover, later still they have a hose to the clean side of the air cleaner. If oil is coming out this breather it will be soaked in oil and reluctant to let air in. Yes, you can reduce your drilling but the main path for the fumes under full load is still the large hose to the throttle body.

If your valley gasket is popping it's buckled, either from excessive fuming (broken rings?) or loose end clamps. Fit a new one ASAP as the old one will be cracked or loose at the ends.

Made a new breather tee with a smaller 1.5mm orifice and all seems well.... for now. When you think about it, the 2.75mm orifice had nearly 4 times the aera of a 1.5mm one, a pretty big jump up in size.

It dosn't seems to fume excessivaly and i think my main problem was the blocked hole in the throttle body (linked to the large breather hose). What size should this be?