No Oil Filter???

The cylinder pressure created by the combustion is what makes the rings seal REAL well. When there's no combustion, the rings leak more. or would leak.. if there was pressure difference. So John has a good point. I just refused to believe that the piston rings would leak THAT BAD when there's vacuum in the cylinder, it would mean that also oil from the cylinder walls would get sucked in in large quantities. And you'd get the typical symptoms of WORN rings, engine blowing smoke.

Jan

ROFTLMAO

:D

Jan

That is some good info!!! Thanks Jan!

Narley Dude®

EDIT:

it was a Bosch 12V M/T Starter.

Narley Dude®

Please summarize your views for me on what is needed with a sand seal. I have the same problem my new motor. John, are you saying that no pcv valve needed on the line to the carb unless I vent the valve covers with a filter? I was going to vent it in this manner before this discussion got going. Jan, do you think my method is valid or should I not use a pcv valve on the line to the carb? I appreciate the summary.

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Ooh, ooh, I DO get it! It would be like me sticking you with really small sharp needles instead of a 12-penny nail! Or getting into an elevator with you and letting out a series of small but really stinky farts instead of one big one . . . like that?

Okay, then we seem to have established that a case with only one vent, e.g., will under driving conditions breathe both in and out. And since neither John nor Raymond report any adverse effects from just slapping a sand seal on and running engines under those conditions, it appears that this is sufficient ventilation for general driving under average conditions.

Let's see . . . to order a sand seal . . . John's site says that I must be careful! "There have been many different sand seal "standards" over the years. Every different manufacturer of sand-seal pulleys and seals uses a different configuration, it's very confusing!"

Okay, I'm ready to be careful! John -- what do I want to order for this new Mexi 1600 DP? It's just got the old stamped steel pulley from the Wonderbus's previous engine.

I don't recall your engine configuration, but on my Raby engine, Jake installed breather attachments to the rocker covers. I run those up to a collector which has a small air filter, and a valve to occasionally drain the accumulated oil.

Install the sand seal. The preferred ones are the machine in (we rent the cutter to do the case while the engine is still assembled), but slip in will work (you must glue in the seal if you go this route).

Then just have an operational breather tube, to the filter. If you don't care about the environment but only your engine, you can route this tube to a filter in the open air. This prevents sucking in dirt on decelleration, since the filter removes the debris.

John Aircooled.Net Inc.

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It depends on if you want to run a slip in seal, or machine in seal. It also depends on if you want to run a steel or aluminum pulley Mike.

I'll check, I think I have a steel pulley here that's already been cut for the seal, so it would be an easy conversion.

John ACN

Yes -- WAAAAAAY up this thread was a post giving links to a site with pics showing a similar arrangement. This oil filter thread branched into a couple of major discussions, one being whether such additional venting was icing on a cake or not, the other a "nyah nyah nyah" spitting match about whether JC Whitney parts are as good as specialty shop parts. Other branches grew in other, sometimes icky directions, such as the mayonnaise one. Enter at your own risk.

True, but the point is, diesel engines get by for the most part by simply venting the excess pressure. No suction, no flow and when we rebuild them, there is no unusual buildup in the crankcase.

Even VW couldn't design a system to get rid of the creamy goo buildup in the filler necks on 75-79 FI engines (which ran even hotter than the older engines). They simply sent out a service bulletin acknowledging the issue.

RT

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I don't see any need for a one-way valve?

Jan

...............I couldn't help it. Shaggie's ugly head is such a tempting target and I'm always trying to hit it with something.....anything. And the girls think it's funny too! Can I go back to my seat in the back row now?

..............Sheesh! Time-released spit wads? Isn't technology great?

No, you sit right up here between Priscilla and Prudence.

..............Lets see, Priscilla has big knockers and Prudence doesn't wear any panties........hmmmm.

............YIPPEEE !!!!

The engine is assembled and in the bus. I will be pulling the rear apron. mustache bar and rear tin bits, as I will in installing a new oil pump anyway. So whatever kinda sand seal that can be installed when the bus is like that will be fine, I reckon. Steel or aluminum pulley? Whatever works.