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Honda mower Model GCV160LAS3H low compression #4464725
07/20/17 09:27 AM
07/20/17 09:27 AM
Joined: Jul 2017
Posts: 2
Louisiana
troy_fontenot Offline OP
troy_fontenot  Offline OP
Joined: Jul 2017
Posts: 2
Louisiana
I did a compression check which was 31 psi. It should be 71 according to manual. It did run a few times for about 12 seconds and ran really rough with exhaust gasses coming out of the muffler and also out of the carburetor where the air filter is located (never seen that before). I checked online and in the Honda shop manual it stated that for low compression: check to see if valve clearance is correct, check for excessive carbon buildup in combustion chamber, check for defective valve or valve seats, and check for worn piston rings, piston, or cylinder. Can anyone suggest what I can do to fix this problem? Many thanks in advance for your help.

Re: Honda mower Model GCV160LAS3H low compression [Re: troy_fontenot] #4464739
07/20/17 09:43 AM
07/20/17 09:43 AM
Joined: Feb 2014
Posts: 1,981
Upper Midwest by the Lakes USA
SumpChump Offline
SumpChump  Offline
Joined: Feb 2014
Posts: 1,981
Upper Midwest by the Lakes USA
Is the valve cover even slightly dented or bowed in? That will cause this indeed. My money is on the bet that somebody bumped a deck or tree and dented it thus stopping a rocker arm frim moving fully.

Also, whats the history on the engibe? Used on? How old? Unknown prior owner? Previous work done on it?

Re: Honda mower Model GCV160LAS3H low compression [Re: troy_fontenot] #4464741
07/20/17 09:45 AM
07/20/17 09:45 AM
Joined: Aug 2013
Posts: 2,531
Central Maryland
HangFire Offline
HangFire  Offline
Joined: Aug 2013
Posts: 2,531
Central Maryland
Sounds like the valve timing is off.

Tear it down.


Various musings: http://hangfire.net
Re: Honda mower Model GCV160LAS3H low compression [Re: troy_fontenot] #4464754
07/20/17 10:08 AM
07/20/17 10:08 AM
Joined: Jul 2017
Posts: 2
Louisiana
troy_fontenot Offline OP
troy_fontenot  Offline OP
Joined: Jul 2017
Posts: 2
Louisiana
SumpChump: I'm not sure on history of mower. Someone put it the road and I picked it up. I think it's a 2006. I did replace the carburetor because the old one was pitted on the inside. Thanks

Re: Honda mower Model GCV160LAS3H low compression [Re: troy_fontenot] #4464775
07/20/17 10:50 AM
07/20/17 10:50 AM
Joined: Feb 2014
Posts: 1,981
Upper Midwest by the Lakes USA
SumpChump Offline
SumpChump  Offline
Joined: Feb 2014
Posts: 1,981
Upper Midwest by the Lakes USA
If that valve cover isnt dented then I am afraid she was run low on oil and scratched the cylinder loosing compression. If you are retired then tear it down. If you work daily then go to Harbor Freight and buy a "Chonda" (china honda copy) and slap it
On the deck.

Re: Honda mower Model GCV160LAS3H low compression [Re: troy_fontenot] #4464782
07/20/17 10:56 AM
07/20/17 10:56 AM
Joined: May 2003
Posts: 7,326
Oklahoma
Schmoe Offline
Schmoe  Offline
Joined: May 2003
Posts: 7,326
Oklahoma
....that's why it's on the road. Engine swap sounds like a good, fairly cheap solution.


01 Supercrew Lariat 4X4
06 Accord EX-L V6
14 CRV EX-L (RIP) 2018 CRV EX-L
Re: Honda mower Model GCV160LAS3H low compression [Re: troy_fontenot] #4464802
07/20/17 11:17 AM
07/20/17 11:17 AM
Joined: May 2009
Posts: 12,192
N.H, U.S.A.
ARCOgraphite Offline
ARCOgraphite  Offline
Joined: May 2009
Posts: 12,192
N.H, U.S.A.
Does the blade look like it hit a rock? - that can bend a rod. Check valve clearance and soak the cyl in light oil or kero before you chuck it.


2014 Nissan Rogue S CVT, OC#9 41392mi-QSUD10W30 + M110A CHAMP Filter; 2017 Subaru Crosstrek CVT OC#2 ?? mi-SOA/Idemitsu 0w20 + SOA Filter
Re: Honda mower Model GCV160LAS3H low compression [Re: ARCOgraphite] #4464963
07/20/17 01:26 PM
07/20/17 01:26 PM
Joined: Aug 2009
Posts: 10
Texas
CPB Offline
CPB  Offline
Joined: Aug 2009
Posts: 10
Texas
Does this motor have a compression release for starting? Most of this type of motor do. If so, how do you override for compression check?

Re: Honda mower Model GCV160LAS3H low compression [Re: CPB] #4465053
07/20/17 02:55 PM
07/20/17 02:55 PM
Joined: Nov 2013
Posts: 1,916
Chicago, IL
EdwardC Offline
EdwardC  Offline
Joined: Nov 2013
Posts: 1,916
Chicago, IL
Originally Posted By: CPB
Does this motor have a compression release for starting? Most of this type of motor do. If so, how do you override for compression check?


That's what I was thinking too, don't most engines nowadays have a compression release? Can you do a leakdown test instead?


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