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Small Air Cooled Gasoline Engines

Briggs and Stratton ZZP really hard to turn over after rebuild


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  #41  
Old 10-11-2017, 10:00:16 PM
mike758 mike758 is offline
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Default Re: Briggs and Stratton ZZP really hard to turn over after rebuild

There honestly is a good chance the bore isnít correct, they asked me for wall clearance and I couldnít find the spec anywhere. The piston is a later reproduction, so the rings are slightly different then the oem, a little thinner and no top groove. Regardless though, Iím going to try and gap them, see how it works out.
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  #42  
Old 10-12-2017, 09:59:12 AM
beezerbill beezerbill is offline
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Default Re: Briggs and Stratton ZZP really hard to turn over after rebuild

You really, really need to get a measure of the clearance before going any further. Without any other information as to piston type, etc., a good guess is about .003 inch clearance. Slightly loose is better than too tight. Without doing anything else, you can measure the clearance with a piece of notebook or printer paper - the cheap thinner stuff is about .003 thick and a piece about half inch wide should slide between the piston and cylinder wall, at the bottom of the skirt and 90 degrees to the wrist pin. Do this with everything dry - no oil on the piston, and with no rings on the piston either. You can slide the piston into the cylinder from the top, upside down and using the rod as a handy handle. Dangle a long piece of notebook paper in the cylinder first, close to the wall, and then slide the piston in along side of the paper. If all is well the piston will slide in without tearing the paper. This operation is better done using a set of feeler gauges but if you don't have any the printer paper trick is a good sanity check.

If the engine goes together OK but the clearance too small it is likely to seize - believe me I know.

Last edited by beezerbill; 10-12-2017 at 10:29:32 AM. Reason: clarification after the coffee kicked in
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  #43  
Old 10-12-2017, 02:57:32 PM
gdstew gdstew is offline
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Default Re: Briggs and Stratton ZZP really hard to turn over after rebuild

According to the original B & S manual, the clearance is

skirt to cylinder---.007-.0085

ring gap .007-.015"

This is using B & S parts, aftermarket may be different

---------- Post added at 02:57:32 PM ---------- Previous post was at 02:54:28 PM ----------

This is the website

https://www.briggsandstratton.com/na...fications.html
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  #44  
Old 10-17-2017, 10:25:12 PM
mike758 mike758 is offline
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Default Re: Briggs and Stratton ZZP really hard to turn over after rebuild

Ok so I took it back to the machine shop to get measured and itís within spec. So Iím going to go ahead and file the rings. What Iím surprised is that the oil ring has to be filed, itís an OEM part thatís probably as old as the engine is.
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  #45  
Old 10-19-2017, 12:08:54 AM
K-Tron K-Tron is offline
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Default Re: Briggs and Stratton ZZP really hard to turn over after rebuild

Are you sure you have the correct ring set? You should not have to file the rings with a fresh cylinder. Something simply does not sound right. How much are you planning to file the rings to get the appropriate end gap?

Chris
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  #46  
Old 10-26-2017, 10:05:52 PM
mike758 mike758 is offline
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Default Re: Briggs and Stratton ZZP really hard to turn over after rebuild

I got the engine back together tonight. I cleaned all the electrical connections, installed a new spark plug wire, and cleaned/gapped the points. I luckily have a nice strong spark. I cleaned the fuel tank, line, and sediment bowl which had ancient gas in it. I also took apart and cleaned the carb, then backed off the needle 1 1/4 turns as recommended. I didnít get anything, but the spark plug was clean and the carb has gas dripping out of it so I believe itís losing vacuum somewhere causing the gas not to rise up. Iím going to trouble shoot tomorrow and go at it again.
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  #47  
Old 10-27-2017, 09:45:27 PM
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TractorDom TractorDom is offline
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Default Re: Briggs and Stratton ZZP really hard to turn over after rebuild

change machine shop
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  #48  
Old 10-27-2017, 11:31:22 PM
mike758 mike758 is offline
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Default Re: Briggs and Stratton ZZP really hard to turn over after rebuild

No, itís good now. Got it to cough tonight, just need to find the right choke settting and get the show going
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  #49  
Old 11-11-2017, 11:39:30 AM
Jerry Jerry is offline
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Default Re: Briggs and Stratton ZZP really hard to turn over after rebuild

whats new with this project ?????
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  #50  
Old 11-25-2017, 10:57:34 PM
mike758 mike758 is offline
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Default Re: Briggs and Stratton ZZP really hard to turn over after rebuild

Ok, so it finally runs, and it runs well. Took some time away but got it running. Only issue now is the carb has gas pouring out of it, so either the needle isnít seating properly or the float is bad.

So just to summarize all I did without he issues:

-Bore cylinder .020 over
-Gapped piston rings and installed new piston and rod
-Cleaned electrical contacts, set point gap, replace spark plug wire and install new plug
-Clean 30 year old gas out of tank and replaced with new
-Fill oil
-Lap new valves and install
-Install new head gasket and put head on
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  #51  
Old 11-26-2017, 12:44:23 AM
Boudreaux South Louisiana Boudreaux South Louisiana is offline
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Default Re: Briggs and Stratton ZZP really hard to turn over after rebuild

Float could have pin hole in it causing that. It will have gas inside of it.....

2 ways to fix......... Solder the float after it has been emptied........ Or use a tank sealer on the float 2 times..................
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  #52  
Old 11-26-2017, 01:55:18 PM
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Turbo Turbo is offline
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Default Re: Briggs and Stratton ZZP really hard to turn over after rebuild

I just read this post and it reminds me of a the Kohler engine I rebuilt for my Cub Cadet original several years ago. I needed to bore it .020. The machine shop had all the specs and even the oversize piston for reference but still screwed it up. They bored it the exact size as the piston with no clearance. Needless to say the rings did not fit!! Sounds exactly like your problem. But as you found out unless you are building a house things don't go together with a hammer!!

Last edited by Turbo; 11-26-2017 at 03:24:02 PM.
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