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Hank F.
Hank F., Technician
Category: Small Engine
Satisfied Customers: 14888
Experience:  Certified on Onan and Generac generators
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Model: 204412 Type:0142E1 Code:040405yd mfg of a Wheel House

Customer Question

Model: 204412 Type:0142E1 Code:040405yd mfg of a Wheel House Generator 5500 Surge 8500 Model# ***** SN:#1010173716 Engine starts great, under load of the rotor stator either the rotor stator or the engine knocks. Hard to tell where the noise is coming from. Under load it will stall the engine. Rotor looks like it has been rubbing on the side of the stator. All Bearings are good. No bind on engine it starts perfect time. What is this freak problem?
Submitted: 1 year ago.
Category: Small Engine
Expert:  Hank F. replied 1 year ago.

Hello, my name is ***** ***** I am going to assist you with this.

There is nothing in the rotor or stator that can knock, unless they are physically hitting each other.

The stator can not move at all, as it is bolted directly to the engine housing.

The rotor only has 2 places that it can move - the bearing end or the crank end.

If the bearing is good, and there is no looseness there, then you need to look at the crank end. You may well have a broken crankshaft, or a bad crank bearing.

Putting a load on the generator puts a load on the engine. If the crank is broke or a bearing as bad, it can easily create movement - and end up doing a lot more damage.

What you need to do is to remove the generator from the engine, and inspect everything carefully. If nothing is visible, try moving the crankshaft. There should not be any movement.