Can a GXV120 be rebuilt?

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Ralph63

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I took it to my local Honda dealer, he told me to forget about trying to rebuild the motor, actually said cant be done, started showing me new models.

I want to fix it.

Hard to start cold, but impossible to start once warm.

Seems to have lost compression, I was thinking a hone & rings, or maybe a burnt valve.

Ive rebuilt many auto engines before, im sure I can handle a mower engine with some guidance.

Its an old model, made in japan, HR194 / GXV120-1199573

can someone tell me if its an A1, A2 etc for parts reference?

having trouble uploading photos.

Mark
 
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mechanic mark

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<a href="http://www.amazon.com/Honda-GXV120-GXV160-Engine-Service/dp/B00HUZAK7G" target="_blank">http://www.amazon.com/Honda-GXV120-GXV160-Engine-Service/dp/B00HUZAK7G</a>        Absolutely yes,purchase this manual, valuable information for your engine rebuild.
 
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Ralph63

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mechanic mark said:
<a href="http://www.amazon.com/Honda-GXV120-GXV160-Engine-Service/dp/B00HUZAK7G" target="_blank">http://www.amazon.com/Honda-GXV120-GXV160-Engine-Service/dp/B00HUZAK7G</a>        Absolutely yes,purchase this manual, valuable information for your engine rebuild.
Click to expand...

thanks for that, I cant purchase from amazon, can give me a description of the manual so I can search for it?
 
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bertsmobile1

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Honda sell their manuals on both evil pay and Amazon.
Other than that they can be ordered through a Honda dealer but they are more expensive that way and take a lot longer.
Yes they can be rebuilt but not by a dealer where is become uneconomic.
There is 4 - 6 hours in it plus parts plus machining by which time the rebuild exceeds the replacement price
There are 4 oversize pistons available and 2 undersize con rods.
A full gasket kit is around $ 40 ( AUS ) so it costs me around $ 200 to rebuild one in parts & machining.
As such there are 6 of them in the graveyard waiting rebuild or plifering.
 
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Ralph63

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bertsmobile1 said:
Honda sell their manuals on both evil pay and Amazon.
Other than that they can be ordered through a Honda dealer but they are more expensive that way and take a lot longer.
Yes they can be rebuilt but not by a dealer where is become uneconomic.
There is 4 - 6 hours in it plus parts plus machining by which time the rebuild exceeds the replacement price
There are 4 oversize pistons available and 2 undersize con rods.
A full gasket kit is around $ 40 ( AUS ) so it costs me around $ 200 to rebuild one in parts & machining.
As such there are 6 of them in the graveyard waiting rebuild or plifering.
Click to expand...

thanks burt, just found one EBay but $56USD, think ill wait for a better deal.
I just rang my boring guy, he cant do the Honda bore because of the size and shape of the engine housing, he doesn't have the jig anymore, only does bike motors now.
So I hope the std piston can back in.
I might start pulling it down now, ill post how it goes.
 
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bertsmobile1

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Ralph63 said:
thanks burt, just found one EBay but $56USD, think ill wait for a better deal.
I just rang my boring guy, he cant do the Honda bore because of the size and shape of the engine housing, he doesn't have the jig anymore, only does bike motors now.
So I hope the std piston can back in.
I might start pulling it down now, ill post how it goes.
Click to expand...

That is the price from Honda.
Unless you find a used copy, that is what you are going to pay
 
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Ralph63

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So this is where its at.

Ive moved ahead without the shop manual.:ashamed:

Two head bolts were loose so gasket was leaking. No compression.

I nearly put it back together but decided to pull the flywheel off, the key was sheared so that explains the misfiring which I didn't mention before.

Ive gone this far so may as well keep going, new rings at least. I read in a forum I should buy the Honda rings with the 3 piece oil control rings?

Now how to split the case to remove rod from crank. Back to the sand pit.



gxv120 lid off.jpgGXV120 head gasket leak.jpgGXV120 head 1.jpgGXV120 cylinder.jpgGXV120 crank keyway 1.jpgGXV120 flywheel keyway 1.jpg
 
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bertsmobile1

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Ralph63 said:
So this is where its at.

Ive moved ahead without the shop manual.:ashamed:

Two head bolts were loose so gasket was leaking. No compression.

I nearly put it back together but decided to pull the flywheel off, the key was sheared so that explains the misfiring which I didn't mention before.

Ive gone this far so may as well keep going, new rings at least. I read in a forum I should buy the Honda rings with the 3 piece oil control rings?

Now how to split the case to remove rod from crank. Back to the sand pit.



View attachment 33882View attachment 33883View attachment 33884View attachment 33885View attachment 33886View attachment 33888
Click to expand...

Same way as you do any head, criss cross across the cases 1/4 turn then again 1/4 turn then whip them all out
Put a dab of paint on one bolt head and the cases then remove all of the loose bolts in a clockwise mannar from the marked hole.
OR if you already have the gasket kit, trace the gasket on a corn flakes packet then push the bolts into their hole.
Polish the pto shaft with a wire wheel.
You are going to replace the oil seal in any case but you do not want to damage the running surface on the case.
I hold the shaft in some hardwood in my big vice then tap off the smaller case.


Finding loose head bolts is not uncommon.
I have a Kanga Loader in here at the moment with a GX 670 that is trashed because the owner has put in several hundred hours with loose head bolts , warping both heads , erroding the barrels & burning one exhaust valve.
If I can weld & machine the heads and machine the barrels the parts bill will be around $ 500 and the labour well over $ 1000.
 
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Ralph63

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Having a bugger of a time getting the cutting disc off the crank!

ive also noticed some end play in the crank.
 
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