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| LM340 - major cooling system leak |
| Author |
Message |
    
Andy Day
Member
Username: aday_in_nh
Post Number: 5
Registered: 10-2007
| | Posted on Sunday, May 11, 2008 - 09:07 pm: | 
|
Engine is running strong - had it out running today (18' Resorter). As I was returning to the dock I caught a wiff of an overheating smell - temp gauge was at 140. Opened the engine box and found water being slung up by the flywheel over everything. Shut the motor down and noticed that the bilge was full.
Now my question. What is in the flywheel bell housing that could produce such a massive leak? Is there a freeze plug back there? No water in the oil and, cept for the giant leak, engine was running great. Any insight would be appreciated. |
Peter H
Member
Username: pfhlaw
Post Number: 34
Registered: 05-2006
| | Posted on Tuesday, May 27, 2008 - 11:45 am: |
|
Did you put the bilge plugs in before you launched? Many of us have made that mistake.
The flywheel might just be flinging the water coming from in from some other point.
Check the exhaust. Is water being pumped out with the exhaust?
Check the freeze plugs in the block. You might have popped one out over the winter. If so, do a leakdown test to see if the block is cracked. |
Andy Day
Member
Username: aday_in_nh
Post Number: 6
Registered: 10-2007
| | Posted on Tuesday, May 27, 2008 - 03:14 pm: |
|
Got it fixed this weekend. There are two 1 5/8 brass freeze plugs in the block in behind the flywheel. Replaced the "missing" one and knocked out and replaced the other one so I wouldn't have to get back in there again. Took about 6 hours to get to them and about ten minutes to replaced them. |
Peter H
Member
Username: pfhlaw
Post Number: 36
Registered: 05-2006
| | Posted on Wednesday, May 28, 2008 - 05:04 pm: |
|
Cross your fingers and hope that the freeze didn't crack the block. A week antifreeze mixture will semi-freeze like a slushy. Theoretically, it can push out the freeze plugs but not crack the block because it "flows".
Look for water in the oil. |
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