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Small Air Cooled Gasoline Engines

Briggs and Stratton ZZP really hard to turn over after rebuild


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Old 08-20-2017, 09:11:36 PM
mike758 mike758 is offline
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Default Briggs and Stratton ZZP really hard to turn over after rebuild

I have a 1949 Briggs and Stratton ZZP out of a Shaw Duall. The previous owner had the engine apart and said it had no compression, so I took the cylinder to a reputable machine shop to get measured. They ended up going .020 over, and I brought them the new piston assembly to test fit. Right now I have the cylinder and head installed to the engine. I lubricated the cylinder with a light amount of 2 cycle oil before installing the piston.

The issue I'm having now is the engine is extremely hard to turn over. I don't even have a plug installed, and I have to use a long socket wrench just to turn it. It's almost as hard to turn as the V8 on my pickup truck. I tried using my power drill to spin it and that didn't work. The lubrication system is a splash type, so I need speed to add more lubrication. I was wondering if maybe I should drip some oil down the spark plug hole, and put some oil on the valves through the side cover.
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Old 08-20-2017, 10:41:48 PM
Heins Heins is offline
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Default Re: Briggs and Stratton ZZP really hard to turn over after rebuild

It sounds like the rod is too tight on the crankshaft. How tight did the piston fit in the cylinder? I think you better loosen the rod bolts a little and see if the engine will turn over easier. If it does, the rod bearing is too tight.
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Old 08-20-2017, 10:45:23 PM
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Default Re: Briggs and Stratton ZZP really hard to turn over after rebuild

Rings not gapped and binding? Rod cap on backwards? Piston clearance?

That's about all it could be causing the problem.
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Old 08-20-2017, 11:11:46 PM
Thaumaturge Thaumaturge is offline
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Default Re: Briggs and Stratton ZZP really hard to turn over after rebuild

Concur with rod bearing binding. Aftermarket parts not always to spec.
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Old 08-20-2017, 11:21:07 PM
mike758 mike758 is offline
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Default Re: Briggs and Stratton ZZP really hard to turn over after rebuild

The rods still the original rod, I never even took it out. The piston was really hard to slip on, so I'm thinking if there's no other contributing factor, maybe the machine shop didn't actually check, or maybe they overlooked it. It could also be due to the part being out of spec, I gave them the ring gap as described in the manual, but if the specs are different maybe there's some kind of variance there.
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Old 08-21-2017, 01:27:42 AM
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Default Re: Briggs and Stratton ZZP really hard to turn over after rebuild

Did you have the crank out and maybe used too thin a side cover gasket? It may not have any end play on the crank.
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