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Old 04 February 2009, 07:01   #11
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Had a really stubborn Merc 6 cyl once, the only way we could get that apart was by using a hole saw on the leg halfway up to gain access to the shaft, then chop it through with the gas axe. This allowed it to be stripped without damage to the casings. the intention was to get a local bloke who specialised in shortening halfshafts to weld it back together, but unfortunately when we eventually slide hammered the end out of the crank there were no splines on the crank or shaft, and the engine was scrapped. shame it was a nice early one too. a bit of grease every season can save a lot of hassle.
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Old 04 February 2009, 15:49   #12
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Quote:
Originally Posted by ollyit View Post
Chris,

I have a very slight left and right movement a tiny gap probably 1mm at the front section near the prop end
Olly
Olly
Unfortunately that does sound like a classic splines stuck in the crank situation. - Sorry.
You don't really have many options apart from warming the engine up and cooling it down a few times. As the engine hasn't been run in a few years this may release it if its not too bad. It could help to get the engine in a wheely bin as deep as possible to flood the exhaust chamber with water to cool the shaft.

Some absolute last resorts:-
-Source another bottom end and destroy the old one getting it off to gain better access to the drive shaft.

-Strip the powerhead in situ, splitting the crankcases from around the crank and hope you can get it off on its own.

-Turn the engine upside-down and fill the exhaust with diesel, some of which may find its way to the join and loosen it off. Although you'll also fill the cooling system and crankcase with diesel via the exhaust ports.

-Ebay the engine.

Nasher.
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Old 05 February 2009, 07:43   #13
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Quote:
Originally Posted by Nasher View Post
Olly
Unfortunately that does sound like a classic splines stuck in the crank situation. - Sorry.
You don't really have many options apart from warming the engine up and cooling it down a few times. As the engine hasn't been run in a few years this may release it if its not too bad. It could help to get the engine in a wheely bin as deep as possible to flood the exhaust chamber with water to cool the shaft.

Some absolute last resorts:-
-Source another bottom end and destroy the old one getting it off to gain better access to the drive shaft.

-Strip the powerhead in situ, splitting the crankcases from around the crank and hope you can get it off on its own.

-Turn the engine upside-down and fill the exhaust with diesel, some of which may find its way to the join and loosen it off. Although you'll also fill the cooling system and crankcase with diesel via the exhaust ports.

-Ebay the engine.

Nasher.
And the hole saw throug the leg trick....never fails, you may need a new driveshaft or a halfshaft welder though .......
1" holesaw will go through in seconds then cut the drive shaft through with a hacksaw blade.
the shafts weld really well, i shortened a few early evinrude twins like that
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Old 05 February 2009, 08:16   #14
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Thanks guys - appreciate your help
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Old 08 February 2009, 07:53   #15
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Come on Olly............How you coming along with getting that bottom unit off?

Nasher.
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