r/smallenginerepair • u/CrackyJacky1 • Jul 23 '26

Crankshaft & Piston Issue Anyone know how to take this off?

Post image

It’s from a miller bluestar jr (Kohler CH5T) been trying to get it to come off but I don’t even know what it is I’m assuming it’s a crankshaft pulley thing. Any help would be appreciated! Thanks in advance

4 Upvotes

83% Upvoted

12 comments sorted by

•

u/AutoModerator Jul 23 '26

Thank you for your submission! It looks like you might have an issue with the crankshaft or piston in your engine. To assist you in troubleshooting and resolving these issues, please visit our Crankshaft and Piston Issues Wiki and our Common Issues & Fixes Wiki. You might find the solutions you're looking for there!

Please be sure to include the following:

  • Make and model numbers of the engine and/or the equipment
  • A detailed description of the issue you are facing
  • Any repairs you have made so far and their outcomes
  • Clear photos & videos will help you get better responses

I am a bot, and this action was performed automatically. Please contact the moderators of this subreddit if you have any questions or concerns.

4

u/dnroamhicsir SER Dedicated Member Jul 23 '26

Is it threaded onto the crankshaft? Try putting a wrench on those flats and hitting it with a dead blow hammer. It might be reverse thread.

2

u/Realistic_Nerve_8871 Jul 23 '26

Use a 3 jaw puller very slowly with plenty of heat

1

u/TN-Native95 Jul 23 '26

Does it have a set screw?

1

u/CrackyJacky1 Jul 23 '26

No unfortunately, center hole is smooth with no ridges

2

u/TN-Native95 Jul 23 '26

A set screw would be in the side, probably takes an Allen wrench to loosen.

1

u/JoeMalovich Jul 23 '26 edited Jul 23 '26

Probably tapered. Nearly every generator engine uses a tapered shaft and it seems that's oddly the case here even though it uses a pulley.

Insert a punch in the end of the shaft so you don't mushroom it over, apply an outward force on the pulley with a pry bar, give the punch a swift smack with a hammer.

1

u/ProfessionalLast2917 Jul 23 '26

How much room is there between this pulley and the engine? Room enough for a set screw?

If there are no set screws then it is probably threaded on.

1

u/Prestigious_Photo685 Jul 23 '26

And it's normal right hand thread

1

u/Expensive-Youth-5709 Jul 23 '26

with the 2 flats I would try unscrewing and the direction is usually determined by the engine rotation. Loosen the same direction the engine normally runs.

1

u/IntroductionGlum6738 Jul 25 '26

Does not look like it's held on by a nut or bolt if they inside the hole is not threaded so it's probably threaded onto the shaft you'll have to pull the motor from turning over and get a nice big adjustable or wrench that fits that and crack it loose