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GPU Lessons and Questions

Des Moines Boater

Des Moines Boater

Well-known member
I just found out that 4 quarts of oil is all I was running in my PE-150, 220 GPU single mag engine. It ran fine, the oil pressure and oil temp were always good. The most oil I had was six quarts. The dip stick wasn't marked, so, when I got it home I marked the spot it was at as the full mark and just filled to that level. Yesterday I decided to drain all the oil, clean the screen and put on a sight gauge instead of using the dip stick. All I got out was a little over 4 quarts. I put 10 quarts in and will not let it get below 8. Still nice to know I can safely go to 4 quarts with no ill effects.

I had the single rear breather tube and it had been pouring out about a quart or more per hour of run time. I plugged the rear vent and now have it vented out the top of the motor near the prop end. I hope that helps. If not I may put one of my extra oil/air separators on it.

The engine seems to use 7 to 8 gallons per hour. I may have to try auto gas instead of 100 LL avgas. I can get the 100LL at the airport I have my planes at but it's still a pain since I have a 30 gallon tank on the boat. I would need six five gallon cans or I'd have to take the boat to the airport with me.

I have the mag timed at 24 degrees before top dead center. The engine starts and runs great and the cylinder temps are right at 400 to 425. If I do switch to auto gas, should I set the timing to 26 or 28 BTDC?
 
Don`t know about the mag,but a fried of mine had a bad blow by problem,He found out his oil cooler was restricted,cleaned it out and don`t hardly use any now.And by hardly any I mean he was 7-8 quarts if rode alot on the hill,and last weekend he didn`t use a hole quart :shock:
 
I have never had good luck with running the vent at the rear by the prop ,I have always run a front vent with a oil guard or one on the fill tube .
 
Des Moines Boater":1xzxti9i said:
I just found out that 4 quarts of oil is all I was running in my PE-150, 220 GPU single mag engine. It ran fine, the oil pressure and oil temp were always good. The most oil I had was six quarts. The dip stick wasn't marked, so, when I got it home I marked the spot it was at as the full mark and just filled to that level. Yesterday I decided to drain all the oil, clean the screen and put on a sight gauge instead of using the dip stick. All I got out was a little over 4 quarts. I put 10 quarts in and will not let it get below 8. Still nice to know I can safely go to 4 quarts with no ill effects.

I had the single rear breather tube and it had been pouring out about a quart or more per hour of run time. I plugged the rear vent and now have it vented out the top of the motor near the prop end. I hope that helps. If not I may put one of my extra oil/air separators on it.

The engine seems to use 7 to 8 gallons per hour. I may have to try auto gas instead of 100 LL avgas. I can get the 100LL at the airport I have my planes at but it's still a pain since I have a 30 gallon tank on the boat. I would need six five gallon cans or I'd have to take the boat to the airport with me.

I have the mag timed at 24 degrees before top dead center. The engine starts and runs great and the cylinder temps are right at 400 to 425. If I do switch to auto gas, should I set the timing to 26 or 28 BTDC?
Click to expand...
Good luck!!
 
I had a old man who builds these tell me that the one vent front or rear is not enough that engine needs both vents
 
Looks like a few replies got lost with the new server upgrade including mine. Anyway, thanks Joe, I forgot about the oil cooler and it was full of crud too. It's clean now. I'll run it with 10 quarts of oil and 100 LL avgas for awhile and then I'll try the other suggestions.

I will change the timing to 30 degrees later and see what the results are. The Sea Foam thing looks like something I need to do just before the next oil change.

I still get confused on the front of the engine and the rear. As an old airplane guy the front is always the prop end and the accessory case is the rear. I think most airboaters have it the other way around. I'll have to get my mind right.

I don't have a tube on my filler neck so I'll try different vent ports until I get one right. If I need to vent both I can. Just looking for what is best.
 
Sounds to me that there is something wrong if you need additional crankcase venting....never had that problem with mine. Maybe time for a rebuild!

Grant
 
grants got a point my little boats got a pe90 ivented front an back for the same reason turned out blow by was the culprit broken ring new jug piston an rings presto no oil loss plus more power more rpms = more pitch in the cypress blades = happy plumcrazy i think a compression check may be in order 8) the best place to vent these engines is on the filler neck drill a 1/2 hole an braze 1/2 conduit at a 45degree upwards lot less oil sloshing around there
 
Compression is all right but the oil in the cooler was thick and the oil screen was plugged with sludge. I now have 11 quarts in the engine. It looks like the oil cooler took about a quart and one half.

Grant, where is the best place to vent? I moved mine from the accessory case to the top of the engine near the prop. That's probably wrong. Plumcrazy, I like the idea of a tube on the filler neck. I just need to figure how to take the neck off to weld a tube to it. I sure don't want to weld it while it's on the engine.

Another question. Does anyone drive down the road with the rain cover on the seat? It looks like it should stay on but I hate to chance it unless someone else has tried it.
 
Its been a while since I owned that motor, but I believe it was vented on the accessory case above the fuel pump.
I could be wrong and I have seen them vented at the filler neck. That seem to work well.

Grant
 
Looks like you were correct again Grant. I ran two half inch clear hoses yesterday. I had one connected to the top of the engine by the prop and the other on the accessory case. Only a little moisture from the accessory case and oil was slung out from the top connection. I plugged the top and I'll run the vent from the accessory case. Cleaning the oil cooler and the oil screen seems to have made a big difference.
 
i'm not near the mechanic as all of you are....can i ask how often you should clean the oil screen and oil cooler? is there any tricks to getting the oil screen out or back in correctly? thanks for all the posts....i'm learning!

as for trailering with the seat covers, i've done it on accident and they stay on. they do, however, seem to stretch. i wouldn't recommend doing it.
 
My plan is to clean the oil screen and oil cooler at each oil change, 25 or 50 hours. That obviously was not done by the previous owner. He did use the good Aeroshell oil. On a 4 cylinder Lycoming just remove the 4 bolts that hold the oil screen housing and make sure you have a new gasket. The Continental is simple. Just unscrew the oil screen from the housing. Nothing special.

Good to hear about the rain cover. I expected that answer. On a long trip I'll just strip it down to the bare shell if it looks like rain.
 
i wasn't expecting you to say that often. sounds like i have some work to do. i have 4 cylinder lycoming, can i match up the gasket at a local auto parts store or is it a special aircraft part?

are you just draining the oil cooler or are you putting some sort of thinner through the cooler?

thanks,
brian
 
Does it look like this?
61173.jpg


61173 GASKET- OIL SCREEN ADAPT
Suggested List Price: $1.95
Quantity in stock: 47 as of 03/28/07

http://www.sacskyranch.com/acatalog/Sacramento_Sky_Ranch_Gaskets_163.html
 
i don't know what it looks like. i figured i would be proactive, since i have no idea what i'm doing. thanks for the website...i should be able to get what i need from them. ever cleaned a oil cooler? do you know how?
 
I just did two took them off dumped out then boiled in degreaser for a half hour. I don't know if that is the "proper" way to do it but it worked pretty darn good :D
 
goldhunter_2":1oybp97g said:
I just did two took them off dumped out then boiled in degreaser for a half hour. I don't know if that is the "proper" way to do it but it worked pretty darn good :D
Click to expand...

i was thinking of using gas to thin any sludge, but degreaser would work better. "proper" and "airboat" don't go well together anyways. thanks. --brian
 
We use brake parts cleaner,you can also use carb and choke cleaner,put it in and blow it threw with some air,repeat as necessary.
 
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