Briggs and Stratton 18 HP Twin Hard to turn over
#1
09-20-05, 05:26 PM
Briggs and Stratton 18 HP Twin Hard to turn over
Have a 18HP B&S Twin (422707 0151-01 86111712) that is extremely hard to turn over. Spins great with plugs out. Does this engine have compression release? New battery and cleaned cables.
#2
09-21-05, 01:33 AM
Forum Topic Moderator
Hello Dirt13!
The most common problem I see on these is the top starter bushing. I'd take the starter off and check for side to side play on the starter shaft where the gear is. If there is noticeable movement, replace the bushing, or the entire end cap. While you're at it, remove the brush plate and clean it and the armature/commutator on the starter. It's easy and if you need further instruction, we'll be here.
The bushing wears enough for the starter to bind and the armature begins to scrub the magnets inside the case.
The most common problem I see on these is the top starter bushing. I'd take the starter off and check for side to side play on the starter shaft where the gear is. If there is noticeable movement, replace the bushing, or the entire end cap. While you're at it, remove the brush plate and clean it and the armature/commutator on the starter. It's easy and if you need further instruction, we'll be here.
The bushing wears enough for the starter to bind and the armature begins to scrub the magnets inside the case.
#3
09-21-05, 02:53 AM
Furthermore, an absolute good battery is a must with a minimum 230 CCA on these Briggs opposed twins. The $20 batteries you buy at discount stores won't cut it.
#4
09-22-05, 05:22 PM
Checked the starter - - it's OK
I removed and disassembled the starter. All appears OK! Top bushing has almost no looseness and the armature nor the magnets show any signs of scrubbing! Brushes were fine! Cleaned, lubriplated bushings and re-assembled. Still the same- - like it's turning against extreme compression. Does this engine (B&S 18HP Twin #422707 01151-01 86111712 ) have a compression release built into the cam? Thanks Guys!!
#5
09-22-05, 11:27 PM
Forum Topic Moderator
No compression release on that one that I can recall. These engines are big for that little starter. I'd check the cranking amps on the battery as Puey61 suggested. I suppose valve clearances could be a possibility, although I haven't personally run into that problem on that particular engine before.
#6
04-12-08, 08:06 AM
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hard starting 18hp briggs
i have the same motor that i've been working on,..the problem i ran into was definitly the battery not being big enough,..i went with a 300 cca model,..but then my troubles were still not over,..i've got a float thats not doing its job,..and it's flooding the crankcase,..which in turn causing a hydrolic lock up,..it will start after pulling the plugs and let it spin dry,..then reinsert the plugs and fire it up,. but check your oil as gas may have made its way to the crankcase and diluted it
#7
04-12-08, 08:24 AM
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gas flooding the crankcase
please help,..i have the same motor,.. an 18hp briggs, it seems to be bleeding to death,..i put a carb / fuel pump rebuild kit in it,.. but im using my old float and it is a plastic one with no adjustment. the needle valve that came with the kit did not have a seat with it,.. i looked at the blow up schematic and it doesn't show one,..how do i adjust this to stop it from flooding the crankcase,..thanks, chezzymoto
Last edited by cheezymoto; 04-12-08 at 08:26 AM. Reason: spelling
#8
04-13-08, 01:12 AM
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There is no adjustment. If it's still leaking, then something still needs to be cleaned or replaced. Did you inspect and clean the seat area where the needle goes? Are you sure it's the needle leaking and not the fuel pump?
#9
04-13-08, 09:49 AM
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Originally Posted by cheese
There is no adjustment. If it's still leaking, then something still needs to be cleaned or replaced. Did you inspect and clean the seat area where the needle goes? Are you sure it's the needle leaking and not the fuel pump?
Last edited by cheezymoto; 04-13-08 at 10:19 AM. Reason: spelling
#10
08-07-10, 11:48 AM
Briggs OHV engine hard to turn
Briggs Over Head
Valve engine that is hard to turn. This engine has a compression release made into the exhaust valve cam that lifts the exhaust valve a little early at cranking speeds allowing the engine to spin easier. For this to work properly the valves must be adjusted properly. A little wear in the rocker arm/push rod area and the compression release no longer works. Try adjusting the valves. They are easy to access and only takes a few minutes.
Valve engine that is hard to turn. This engine has a compression release made into the exhaust valve cam that lifts the exhaust valve a little early at cranking speeds allowing the engine to spin easier. For this to work properly the valves must be adjusted properly. A little wear in the rocker arm/push rod area and the compression release no longer works. Try adjusting the valves. They are easy to access and only takes a few minutes.
#11
08-07-10, 11:03 PM
Forum Topic Moderator
Hello and welcome Gdgtoday.
This one does not have the compression release mechanism. It is not an ohv. You are correct, however, that if this were an ohv engine, adjusting the valves would be a good idea and probably fix the problem. Hopefully the original poster has fixed the problem by now (been 5 years ago when this started).
This one does not have the compression release mechanism. It is not an ohv. You are correct, however, that if this were an ohv engine, adjusting the valves would be a good idea and probably fix the problem. Hopefully the original poster has fixed the problem by now (been 5 years ago when this started).
