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PostPosted: 01 Jul 2016, 18:45 

Joined: 27 May 2012, 23:07
Posts: 148
Location: Destin, Florida
Long story short my Motor Siezed up and now is relatively free. However the starter can hardly spin the flywheel enough to start it. I want to do a compression test on it but I don't know where to begin. What should the compression be on each cylinder?


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PostPosted: 01 Jul 2016, 19:17 

Joined: 05 Oct 2008, 12:14
Posts: 4140
Location: Algonquin Il
Why did it seize? Over heat?
Try pulling the plugs and see if the starter will spin the motor?
Have the starter and battery tested.



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1971 14' Ward's Sea King Jon Boat / 1983 Mariner 25HP
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PostPosted: 01 Jul 2016, 19:26 
Donor
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Joined: 15 May 2010, 00:38
Posts: 2609
Location: Central Florida
Pull the spark plugs and have a look at them. Probably #2 cylinder. Whatever plug looks different is the culprit cylinder.
Almost all seizures that just involve piston skirt to cylinder wall will free up as the parts cool. This does not mean the engine
is good to go again, not by any means. If you plan on running it with the damage....pour the oil to it!!!


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PostPosted: 02 Jul 2016, 01:37 

Joined: 27 May 2012, 23:07
Posts: 148
Location: Destin, Florida
Yes it Siezed to do an over heat. I guess it will be needing a rebuild?


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PostPosted: 02 Jul 2016, 17:19 

Joined: 27 May 2012, 23:07
Posts: 148
Location: Destin, Florida
Compression test read 65,30,65. Why would all of the numbers be so low?


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PostPosted: 02 Jul 2016, 18:04 
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Joined: 15 May 2010, 00:38
Posts: 2609
Location: Central Florida
JRyno10 wrote:
Compression test read 65,30,65. Why would all of the numbers be so low?


Probably the gauge and the fact that you said it is not turning over normally. As I indicated...#2 cylinder is toast.


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PostPosted: 02 Jul 2016, 18:07 
Donor
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Joined: 15 May 2010, 00:38
Posts: 2609
Location: Central Florida
There is an updated water pump kit for that engine. Been out for years and years. Chances are you never took advantage of that.
If you do the rebuild make sure you obtain one (not an aftermarket, OEM only) and get the complete kit
not just an impeller. It will have a new thermostat spring, cover, and instructions to re-route the indicator line.


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