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This is a spare engine I picked up for free from a buddy to use on my zero turn when and if my current Briggs intek goes out. Noticed this weekend when pulling it from the doner machine that the output shaft looks deformed on the key way slot and the key looks deformed and maybe broken off the factory pulley?. I'm not sure but aren't these keys molded into the pulleys which would mean this one broke off? Can I still use this engine on my machine if needed or is it a parts engine now? My zero turn has electric pto if that matters.

Model number off both engines please.

The above engine (the proposed replacement) is a 18.5hp intek twin model 407777 and my current installed engine is an 18hp intek vtwin 405777.

407777 1" Diameter x 3-5/32" Length
Drilled & Tapped 7/16"-20 - Full 1/4" Keyway
405577 1" Diameter 3-5/32"
Drilled & Tapped 7/16-20, Keyway

They are a match so you have a direct replacement.

Keyways and something you buy and insert into the grove then add your accessory. It is used to allow engine to turn the accessory.

BlazNT said:

407777 1" Diameter x 3-5/32" Length
Drilled & Tapped 7/16"-20 - Full 1/4" Keyway
405577 1" Diameter 3-5/32"
Drilled & Tapped 7/16-20, Keyway

They are a match so you have a direct replacement.

Keyways and something you buy and insert into the grove then add your accessory. It is used to allow engine to turn the accessory.

Click to expand...

So that deformed area on the shaft won't hurt anything?

The way to check that is to buy a new key and put it in and twist towards the deformed area. If it comes out easily then it will cause problems. The picture you gave us does not really show the extent of the damage.

BlazNT said:

The way to check that is to buy a new key and put it in and twist towards the deformed area. If it comes out easily then it will cause problems. The picture you gave us does not really show the extent of the damage.

Click to expand...

Also Blaz ... isn't that where the " stack-pulley ' or " PTO " rides or ...and it is locked on by a bolt ..??

Key is what the stacked pulley or PTO uses to spin. Should have bolt to hold either on.

BlazNT said:

Key is what the stacked pulley or PTO uses to spin. Should have bolt to hold either on.

Click to expand...

I've never had occassion to remove a stack-pulley ...YET !! But if it's like removing the pulley off my transaxle ...
THAT was a 2 day fiasco ...had to go careful because I was beginning to deform the pulley .

BlazNT said:

Key is what the stacked pulley or PTO uses to spin. Should have bolt to hold either on.

Click to expand...

There was a bolt holding it on. I don't think i am gonna try it till the current engine goes but if nothing else it's a good parts machine....

The key in that particular pulley stack was originally welded in as a part of the assý. Probably the long bolt holding pulley assý loosened letting the pulley work back and forth until it broke off then proceeded wallow the crankshaft keyway. Smooth the edges of the crankshaft keyway, install a good pulley and new key or one with a good welded in key, tighten the bolt holding the pulley assembly in place properly and you will be OK. Last part is important.

Walt Conner

Thanks, I thought that might be a welded key. its from an old mower my buddy replaced when the deck rusted out and broke. I snatched it up as a spare for my zero turn since I have a similar briggs on it now. My mower has a electric PTO on it so hopefully this wont be any issue..... Guess we will see if and when that day comes.

BlazNT said:

407777 1" Diameter x 3-5/32" Length
Drilled & Tapped 7/16"-20 - Full 1/4" Keyway
405577 1" Diameter 3-5/32"
Drilled & Tapped 7/16-20, Keyway

They are a match so you have a direct replacement.

Keyways and something you buy and insert into the grove then add your accessory. It is used to allow engine to turn the accessory.

Click to expand...

Can someone verify this info for me? I was speaking with some people about ordering a new repower professional grade engine or commercial vanguard and Briggs is telling them the proper replacement for mine would have 1 - 1/8 shaft and 4 - 5/16 length? Now I'm real concerned because one or the other is wrong...

Info is incorrect. I have no idea how I looked 2 incorrect engines but I did.

BlazNT said:

Info is incorrect. I have no idea how I looked 2 incorrect engines but I did.

Click to expand...

lets try this Chuck ...

......https://www.briggsandstratton.com/na/en_us/support/faqs/browse/direct-replacement-engine.html

.......http://www.brandnewengines.com/pdf/engine2010.pdf

.......https://shop.briggsandstratton.com/...sAndStratton/PDFs/2014RepowerSpecs MS5568.pdf

BlazNT said:

Info is incorrect. I have no idea how I looked 2 incorrect engines but I did.

Click to expand...

Well that makes sense except the briggs guy telling me they were identical yesterday but he may have been a bit confused....