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White GT1855 engine backfire


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#1 Fdsinozich OFFLINE  

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Posted March 18, 2016 - 10:15 PM

From another post(oh no), the fire damage is repaired. Replaced stator, coil, plugs and carburator. Still the thing is backfiring through the exhaust, varying at different rpms. I adjusted the only adjustment on the carb to no avail. It's a Briggs 422437-0667-01. I don't know what else to do.
Any suggestions?
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#2 larrybl OFFLINE  

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Posted March 18, 2016 - 10:42 PM

Sounds like a flywheel key issue.


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#3 GWest OFFLINE  

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Posted March 19, 2016 - 05:20 AM

Is it possible you have an exhaust valve not closing 100% at times?

Marvel Mystery oil in the fuel will lubricate the valve stems.

 

Garry


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#4 chieffan OFFLINE  

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Posted March 19, 2016 - 06:29 AM

Sounds like a flywheel key issue.

First thing I thought of too.



#5 crittersf1 OFFLINE  

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Posted March 19, 2016 - 08:07 AM

Worn keyway



#6 Fdsinozich OFFLINE  

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Posted March 19, 2016 - 09:07 AM

Probably wishful thinking, but I will get some Marvel today! If the key way is worn, then that means new flywheel?
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#7 larrybl OFFLINE  

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Posted March 19, 2016 - 09:18 AM

Usually a new key will fix it, they are designed to fail before damaging the fly wheel or shaft. Don't be fooled if the key looks fine, just a little shear will affect the timing. This key was the cause of this engine mis-fireing.

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#8 Fdsinozich OFFLINE  

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Posted March 19, 2016 - 09:27 AM

Good info! Not what I wanted to hear since it's all back togefher, but I will order a new key.
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#9 Fdsinozich OFFLINE  

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Posted March 28, 2016 - 10:33 AM

Finally I have some time to look at the tractor. I see a pulley key on outer end of the crank and a flywheel key that looks like it's on the inside of the engine. Which one do you think is worn? If the one I need is the internal one, that is beyond m comfort zone. What do you think?

#10 larrybl OFFLINE  

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Posted March 28, 2016 - 01:23 PM

It will be the flywheel key, hopefully it will be easy to remove sense you had it apart recently.



#11 Fdsinozich OFFLINE  

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Posted March 28, 2016 - 04:32 PM

The tech at the parts store agreed. He said the diagram makes it look internal, but it's the one at the flywheel.
Hopefully I can get on it tomorrow.
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#12 Fdsinozich OFFLINE  

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Posted April 03, 2016 - 10:23 AM

Well, well well.
Replaced the flywheel key, no change. Still backfiring and missing. New carb, coil, stator and plugs and high speed carb adjustment. I don't know what else to do so I'm going to try to find someone locally who can work on it.

#13 Fdsinozich OFFLINE  

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Posted April 05, 2016 - 07:39 AM

Finally got a compression tester, 95 on left bank 0 on right bank. Heads are coming off. I will let you know what he finds (about 4 weeks)
That work is beyond my knowledge base.

#14 Fdsinozich OFFLINE  

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Posted April 12, 2016 - 09:47 PM

Well, the master tech called and said the block is ruined. It is no longer available so a repowered is my only option. He does not have one so I will try to sell it as is with all the attachments on craigslist. I don't want to put anymore money into it.
Thanks for all your help.

#15 KennyP OFFLINE  

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Posted April 13, 2016 - 06:40 AM

A option is to find the vertical shaft version of the 422437. The crank in it can be shortened to the horizontal specs and converted to a horizontal! I have one here I need to finish putting together that way.

I think that would be the 422700 series engines. I have researched the part #'s and they are the same for the block, rods, & pistons! Just have to use the horizontal pan and front engine cover.


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