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Sun Nov 29, 2020 5:50 pm

Recently I "upgraded" my 1641 single relief engine. I added Empt oil pump, oil filter, 1 1/2 sump, oil filter and new Empi power pulley. Motor runs great! i.e.: no oil or vapor leaks......However when I turns off engine about a teaspoon of oil "squirts" out of pulley? That's it! leak stops... I know air cooled like to mark their territory......and a teaspoon isn't that much.......but everytime I turn off motor???......added: my new oil capacity (with filter, cooler, sump, and 10' of hoses) is now 7 quarts. Any advise or solutions? thanks much

Sun Nov 29, 2020 8:25 pm

The pulley has a reverse screw ridge that pushes any oil back into the engine. I have found that many aftermarket pulleys have a low ridge that does not generate enough air movement to push the oil back into the case. I went through 3 different aftermarket pulleys until I found one that does not allow oil to escape behind the pulley.

Wow, 7 quarts. My external filter/deep sump has 5 1/4 quarts and it takes for ever to warm up, I started putting in only 4 quarts as that allowed a more normal warm up. Cold oil does not allow contaminates from blow-by to evaporate and they sit in your oil longer which ruins it.

Sun Nov 29, 2020 8:39 pm

robcy04 wrote: The pulley has a reverse screw ridge that pushes any oil back into the engine. I have found that many aftermarket pulleys have a low ridge that does not generate enough air movement to push the oil back into the case. I went through 3 different aftermarket pulleys until I found one that does not allow oil to escape behind the pulley.

Wow, 7 quarts. My external filter/deep sump has 5 1/4 quarts and it takes for ever to warm up, I started putting in only 4 quarts as that allowed a more normal warm up. Cold oil does not allow contaminates from blow-by to evaporate and they sit in your oil longer which ruins it.
I don't doubt it. I have never had any trouble with the steel 3.5lb pulley offered by many vendors. GBE calls this the Achiever pulley. Another thing to try is to get a pulley cut for sand seal and and use a push-in sand seal. I wouldn't do this with a cheap aluminum pulley, though.
Is it possible you have blow-by?

Mon Nov 30, 2020 4:48 am

7 qts? should be about 5 qts
only fill to the first line on the dip stick :wink:

Mon Nov 30, 2020 9:38 am

Take pulley off and measure case hole, it should be 50mm.
Sometimes it's been cut to 50.5 or 51mm.
If it's any of the 2 bigger numbers it will leak. There are oversize pulleys available.

Mon Nov 30, 2020 10:49 am

Get a new pulley.

Mon Nov 30, 2020 12:51 pm

I just, litterlly min. ago, machined a pulley for a sand seal. I zero'd it using the snout that goes into the case, then used the front of a crankshaft cut just after #4 bearing and in the pulley then used the bearing surface to zero the pulley, I found the spiral snout section was not true to the crank by almost .020", this was also considered a "quality" pulley.

Mon Nov 30, 2020 3:35 pm

Thanks for responses. I've purchased new pulleys. Also,,,,the grooves in the pulley's neck ARE working properly as stated! The oil ONLY leaks when I shut the motor off! A teaspoon in seconds and that's it. New ideas? thanks again

Mon Nov 30, 2020 6:17 pm

I would double-check the 7 quarts.

I have an oil cooler and 1 1/2 quart thin sump. I don't think I can put in more than 5 quarts. I was surprised how little my Setrab oil cooler holds. Maybe you can check the website for your cooler to confirm how much to allow for it.

Thu Dec 03, 2020 1:20 pm

Thanks for response and info. I drained 1 quart of oil. Now oil level is midway between lines on dipstick. Now when I turn off motor only 1/2 teaspoon leaks out with less pressure. next step I want to try original crank pulley.

Thu Dec 03, 2020 1:25 pm

Is the case vented?