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How do I tell if my 912ULS has a 4 or 6 lobe oil pump?

by in 912 / 914 Technical Questions 5 years ago

I read here: https://www.recreationalflying.com/threads/jabiru-gen-4.69470/#post-507856 that some carbureted Rotax engines with 4 lobe oil pumps have problems that are fixed in the iS which always has a 6 lobed pump. How can I tell if my 912ULS has a 4 or 6 lobe pump?

Re: How do I tell if my 912ULS has a 4 or 6 lobe oil pump?

by Tyler Hathaway » 5 years ago

Tyler Hathaway

3 478 1.39k

How old is your fuel pump? They all need to be replaced after 5 years in service.

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Re: How do I tell if my 912ULS has a 4 or 6 lobe oil pump?

by Bill Hertzel » 5 years ago

Bill Hertzel

13 1.95k 8.01k

ALL 912ULS OIL Pumps have 4 lobes.

The 912is OIL pump is a different diameter, different drive coupling and different Regulator and wiill NOT retrofit onto a ULS Crankcase.

There is no question here. If it is a ULS, it is 4 lobes. No Options.

Bill Hertzel
Rotax 912is
North Ridgeville, OH, USA
Clicking the "Thank You" is Always Appreciated by Everyone.

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Re: How do I tell if my 912ULS has a 4 or 6 lobe oil pump?

by itemprop='name' » 5 years ago

0 0 0

Tyler Hathaway wrote:
How old is your fuel pump? They all need to be replaced after 5 years in service.

Oil pump not fuel pump.

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Re: How do I tell if my 912ULS has a 4 or 6 lobe oil pump?

by itemprop='name' » 5 years ago

0 0 0

Bill Hertzel wrote:

ALL 912ULS OIL Pumps have 4 lobes.

The 912is OIL pump is a different diameter, different drive coupling and different Regulator and wiill NOT retrofit onto a ULS Crankcase.

There is no question here. If it is a ULS, it is 4 lobes. No Options.

Thanks! It's like you know everything there is to know about these engines! :)

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