| Author |
Message |
    
Jason Beasley
New member
Username: jwbeez
Post Number: 3
Registered: 06-2009
| | Posted on Sunday, June 28, 2009 - 12:21 am: | 
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wat should the compression be on my 1995 johnson 115 hp |
Tom Gordon
Advanced Member
Username: tommyg
Post Number: 336
Registered: 02-2004
| | Posted on Sunday, June 28, 2009 - 08:42 am: |
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Should be ay least 90#,and about 10% between cylinders |
Joe Reeves
Senior Member
Username: joereeves
Post Number: 7531
Registered: 02-2001
| | Posted on Sunday, June 28, 2009 - 02:13 pm: |
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Normally 95 psi on the starboard bank and 90 on the port bank. |
Jason Beasley
Member
Username: jwbeez
Post Number: 4
Registered: 06-2009
| | Posted on Sunday, June 28, 2009 - 02:28 pm: |
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thanks for the info.should it be a big concern that 1 cylinder has a 10 lb difference in compression.and could this cause a miss in the motor the miss comes and goes whenever it wants to. |
jwbmarine
Senior Member
Username: jwbmarine
Post Number: 4529
Registered: 11-2005
| | Posted on Sunday, June 28, 2009 - 03:03 pm: |
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not a big deal--,could indicate future prob's w/that cyl...the fact of lower comp only,will not cause ur miss....wtr intrusion due to a bad hd gasket---yes...i imagine ur miss is electrical,..find out which one is missing,by first,a spark test,...all good,then a running test,using timing lite,to determine missing cyl. |
Jason Beasley
Member
Username: jwbeez
Post Number: 5
Registered: 06-2009
| | Posted on Sunday, June 28, 2009 - 03:22 pm: |
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When u say a spark test should I each plug 1 at a time and check the spaerk. Or should I have. Motor running and spark plug wire off one at a time and see on wat cylinder it doesn't make adifference in the motor running |
carl spillman
Advanced Member
Username: papyson
Post Number: 259
Registered: 09-2006
| | Posted on Monday, June 29, 2009 - 07:55 pm: |
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Joe...just curious...why the difference in starboard and port bank? |
Morten Ringvold
Senior Member
Username: haffiman37
Post Number: 3850
Registered: 04-2006
| | Posted on Monday, June 29, 2009 - 08:13 pm: |
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Carl:
Has to do with engine rotation. If rotation the other way, opposite comp result. |
Jason Beasley
Member
Username: jwbeez
Post Number: 6
Registered: 06-2009
| | Posted on Monday, June 29, 2009 - 09:36 pm: |
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thanks for all the info.still need to know how to check if my power pack or coil is bad on johnson.should i be running the engine and pull each plug wire to check the power packs or coil packs or both the power pack and coil pack the same thing just different names when i pull the wire the one that makes the least difference in running would that be the bad one |
Jason Beasley
Member
Username: jwbeez
Post Number: 7
Registered: 06-2009
| | Posted on Wednesday, July 01, 2009 - 11:23 pm: |
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thanks for all the info.still need to know how to check if my power pack or coil is bad on johnson.should i be running the engine and pull each plug wire to check the power packs or coil packs or both the power pack and coil pack the same thing just different names when i pull the wire the one that makes the least difference in running would that be the bad one |
carl spillman
Advanced Member
Username: papyson
Post Number: 260
Registered: 09-2006
| | Posted on Thursday, July 02, 2009 - 04:57 am: |
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Jason....it appears you are determined to do the plug wire pulling thing....go back and read JWMarine,s entry on 6/28..thats the safe and sure way to approach your problem...respectfully...Carl |
Jason Beasley
Member
Username: jwbeez
Post Number: 8
Registered: 06-2009
| | Posted on Thursday, July 02, 2009 - 04:11 pm: |
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how exactly do u run a spark test. and after that how do you run a test with a timing lite.would like to perform both test but not quite sure how to.
Thanking you In advanced,
Jason beasley |
carl spillman
Advanced Member
Username: papyson
Post Number: 261
Registered: 09-2006
| | Posted on Thursday, July 02, 2009 - 05:35 pm: |
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http://www.marineengine.com/products/accessory.php?in=1329766 |
carl spillman
Advanced Member
Username: papyson
Post Number: 262
Registered: 09-2006
| | Posted on Thursday, July 02, 2009 - 05:43 pm: |
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thats a good tool to start with..do you have an induction timing light?you can do the same thing with a board and a few nails but for safety purposes(after assuming you have a low experience level) i think its best we go with the tool..i would personally just throw a timing light on it when it is missing and see where the miss is to start with... |
