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Discussion Starter · #1 ·
I own a 1996 Formula SLS with the 494 Rotax engine, just over 4,000 km.

Engine runs great but I have heard that the crank bearings on this engine are prone to problems. Has anyone heard about this? What is best way to test for bad crank bearings? How much $$ to replace?

Thanks in advance!

Think Snow!
 

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Crank bearing had to be replaced in my 98 grand touring 500 after 9,000 km. Was done before I bought it but previous owner said it was getting "noisy." Not sure what he paid though. Sorry.
 

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Discussion Starter · #3 ·
Thanks for the reply. My engine is not too noisy yet but it is a little hard to tell.

Is there anyone else who can comment on this?
 

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Discussion Starter · #4 ·
BUMP!
 

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Discussion Starter · #5 ·
Bump...
 

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Discussion Starter · #6 ·
Anyone?
 

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Discussion Starter · #7 ·
Last try! Can anyone help with this?
 

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Newf SLS said:
Last try! Can anyone help with this?
[snapback]300064[/snapback]​
PTO side bearings are suspect because of oil starvation. Turn up your oil pump and all is well. My 98 Formula 500 lost the PTO bearings with just under 4000 miles. Installed reman shortblock and turned up the pump.
 

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Discussion Starter · #9 ·
Finally a reply! Many thanks Hubcap!

How much did you turn up the oil pump? How did you know when the PTO bearings were lost?
 
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Finally a reply! Many thanks Hubcap!

How much did you turn up the oil pump? How did you know when the PTO bearings were lost?
I know this is an old topic but I just had 2 PTO bearings go out on mine and am wondering how much to turn up the oil pump?
 

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Discussion Starter · #13 ·
How much is this going to increase oil consumption?
Hi all,

Yes an old topic, but still relevant, at least to me


My SLS has only 4700 kilometers, and I have not replaced any bearings, yet. I have turned up the oil pump slightly - I'm not worried about oil consumption, I'm more concerned about having to rebuild the engine. A new question:

- how can one tell if the PTO bearings are bad? My SLS still pulls very strong, with noise about the same as when it was new.

Thanks,

Safe Sledding
 

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Discussion Starter · #14 ·
Hi all,

Update to this thread - have not yet rebuilt my SLS - turned up the oil pump as suggested - still running strong except now it is VERY hard to pull over when cold. Crank bearings maybe??
 

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I bought my sls from my brother who had the crank rebuilt around 9-10,000 kms..It is very hard to pull over after its been sitting for awhile as well and I am noticing oil in the belly pan and can't seem to find the source of the leak..The engine runs great and doesn't seem to smoke excessively at startup.
 

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Discussion Starter · #17 ·

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Discussion Starter · #18 ·
I bought my sls from my brother who had the crank rebuilt around 9-10,000 kms..It is very hard to pull over after its been sitting for awhile as well and I am noticing oil in the belly pan and can't seem to find the source of the leak..The engine runs great and doesn't seem to smoke excessively at startup.
Hi Chilly Willy. Check for an oil leak through the weep hole on the water pump just under the exhaust. My SLS had this issue a few years back, and I first noticed it with oil in the belly pan. A new oil seal was required on the water pump shaft. It is possible to replace the seal with the engine still in the machine - search "water pump oil seal weep hole" and you will find an excellent thread describing how to complete the repair :biggrin_old:
 

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Discussion Starter · #19 ·
Hi Chilly Willy. Check for an oil leak through the weep hole on the water pump just under the exhaust. My SLS had this issue a few years back, and I first noticed it with oil in the belly pan. A new oil seal was required on the water pump shaft. It is possible to replace the seal with the engine still in the machine - search "water pump oil seal weep hole" and you will find an excellent thread describing how to complete the repair :biggrin_old:
Here is the link

http://www.dootalk.com/forums/topic/205419-rotary-shaft-seals/?hl=%2Boil+%2Bshaft+%2Bseal+%2Breplacement
 
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