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Discussion Starter · #1 ·
I have two Onan engines that I am trying to identify. Any help or tips on where to look for identifying numbers would be appreciated.

Engine 1. Sheet metal says Performer 218XSL. Some of the ID tag has been rubbed off. This is what I can make out:
Model #: ?21?
Spec.:1/1090?
Model:B893518334

Either the tin is not the original and/or the air filter housing is incorrect. The breather tube does not line up with the hole in the bottom housing. The hole in the housing is not centered. It is offset and the breather tube does not reach over that far. It has the newer style filter cover with the offset indented center, but the older style carb deflector. The filter cover bottoms out on the carb deflector and does not seal properly on the air filter. The crank has been shortened to fit the Case lovejoy coupling. The engine fits in my '75 446 with the exception of the tractor hydraulic return tube hitting the starter.

Engine 2. Is a short block take off from an RV generator. The previous owner of my '75 446 had removed it from his RV and installed it in the 446. I have never tried to run it because the P.O. said there is a problem with the governor. The block is painted the Onan generator Blue/Green.

Does piston size differentiate the 16/18/20 horse engines?

Thanks,

Joey
 

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If you are patient, Boomer will show up and answer all your questions.


Your block from the genset may have a governor in it for 1800 RPM. This is done for two reasons. Extend the engine life and make the genset run quieter...... a major factor in an RV when you are in need of air conditioning but wish to sleep.
 

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Discussion Starter · #7 ·
The P.O. said that the governor is broken and the engine "runs away" ungoverned. He had a wire rigged on the gov. lever to control it. Maybe when he swapped blocks he did had trouble swapping over the BF-MS parts or did not know what he was doing. Well, the rigged wire pretty much shows that.
 

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1. Def looks like a performer with that flywheel and air cleaner housing
2. Looks like a B with the Marvel Schebler carb and the points box

If you measure the bore and stroke I can tell you which one they are
 

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joey
your engine needs the J.D. style of air cleaner.
the were one of the few P series that used the breather in the # one tappet cover.
i have one ava.
e/mail or call(best) 651 437 2826 M f 5to 8 pm S/S 12 to 7 pm cent,time.
thank you. boomer
 

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Discussion Starter · #11 ·
1. Def looks like a performer with that flywheel and air cleaner housing
2. Looks like a B with the Marvel Schebler carb and the points box

If you measure the bore and stroke I can tell you which one they are
Mike, I will measure them and get back to you.

I believe that 16-18-20 hp all share the same bore of 3.250"
99flhr, Thanks I will measure and see if they match.

joey
your engine needs the J.D. style of air cleaner.
the were one of the few P series that used the breather in the # one tappet cover.
i have one ava.
e/mail or call(best) 651 437 2826 M f 5to 8 pm S/S 12 to 7 pm cent,time.
thank you. boomer
Boomer,

Thanks. I will give you a call.
 
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