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| Damaged Piston on 671 TIB |
| Author |
Message |
    
TRAVIS ALI
Visitor
| | Posted on Friday, October 12, 2007 - 06:12 am: | 
|
Boat ran perfect for over 200 miles from Trinidad to st lucia at 1950 rpm. 19 kts 178 and 175 degrees. As we slowed down into the marina port side started to smoke rediculously. Thought it was a bad injector turned out about 1/2 inch of the rim from the piston broke off and damaged a few valves in that cylinder. Please tell me what could have caused such a problem to arise . The liners and rings were pretty ok but i think ill rebuild the engine fully. Thanls |
MARVIN PIERCE
Advanced Member
Username: marv
Post Number: 189
Registered: 09-2001
| | Posted on Saturday, October 13, 2007 - 01:38 pm: |
|
POSSABLY TOP RING BROKE UP, MIT HAVE BEEN WORE OUT. IS THERE ENY GROVE LEFT ON THE RING,AND HOW ABOUT THE OTHER RINGS ON OTHER PISTONS. |
TJUNK
Visitor
| | Posted on Sunday, October 14, 2007 - 10:02 pm: |
|
no top ring wasnt broken howver it was visible. we changed thje valves and gaskets jus to get the boat home. i think ill rebuild the entire engine even though the liners and rings seemed fine other people said i should jus change that piston but my mind wouldnt be at ease |
captain William Myers 1
Visitor
| | Posted on Monday, October 15, 2007 - 10:46 pm: |
|
With the low cost of a rebuilt long block, I would not rebuild this engine, there could be other problems. Look through Boats and Harbors Magazine, the price of a complete long block is low. |
MARVIN PIERCE
Advanced Member
Username: marv
Post Number: 190
Registered: 09-2001
| | Posted on Thursday, October 18, 2007 - 04:38 pm: |
|
will keep in mind that a piston will not juat brake something had to cause it""". |
TJUNK
Visitor
| | Posted on Saturday, October 20, 2007 - 08:28 am: |
|
from the look of it, it doesnt seem that the valve hit the piston first. the piece of piston was broken off clean on the rim. There are no dents in the piston either. Someone suggested to me that there is a possibility of one of piece of the impeller side of the turbo broke off and flew into the chamber? |
EJUNK
Visitor
| | Posted on Tuesday, October 23, 2007 - 04:33 pm: |
|
my mechanic says that by the look of it the turbo was going and also the injector might have been putting to much fuel on that one piston causing it to get damaged |
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