>... Never sure how it happened but perhaps overly long cranking during start.
I have experienced diesel engine hydro-locking caused by cranking over an engine reluctant to start with the raw water supply valve open. The water lift muffler fills up without engine exhaust pressure available to push the raw water out. Once the water lift muffler is full there is great risk the water will back up into the exhaust manifold, then into the cylinder through the exhaust valves. Commonly the cylinder(s) being filled is followed closely by a resounding metallic "Clunk". Bent connecting rods and/or valves are a common but not certain result. A failed head gasket or a cracked cylinder head resulting in a lower compression in one or more cylinders will make a diesel hard to start. The slippery slope to hydro-locking begins with a hard to start engine. I do not know how many attempts to start (how many seconds of cranking w/out fire) is safe. On Calypso (Perkins 4-108, medium sized water lift, 12" to 14" lift to exhaust manifold) I expect three attempts of normal cranking (<10 seconds of crank per attempt) would be OK. Here's hoping I remember past lessons if the next time Calypso's engine goes beyond that. Martin DeYoung Calypso 1971 C&C 43 Seattle [Description: Description: cid:D1BF9853-22F7-47FB-86F2-4115CE0BAF2F] From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of David Knecht via CnC-List Sent: Thursday, June 25, 2015 10:36 AM To: CnC CnC discussion list Cc: David Knecht Subject: Re: Stus-List C&C 37+ Repower -- Ugh I bent a rod on my previous Yanmar 3GM and had it rebuilt. The engine ran, but very rough. Never sure how it happened but perhaps overly long cranking during start. Was not nearly as expensive as repower, but also did not add to resale value in any way I could see. Dave On Jun 25, 2015, at 5:24 PM, Edd Schillay via CnC-List <cnc-list@cnc-list.com<mailto:cnc-list@cnc-list.com>> wrote: All, I appreciate the comments and advice - as well as the freedom you have with my checkbook. But, in the end, you're right. I've heard some horror stories about rebuilds (they sometimes don't go 100% to specs and cut corners to get the job done faster) and, in the end, you end up with a less than perfect 25 year-old engine. Better to, as Steve says, "do it right, do it all the way" than "get the job done well enough" and deal with future problems when they come - and yes, I really think its a "when", not an "if". Also, the idea of losing two months of my season waiting for a rebuild is not sitting well with me. Our season here in New York is short enough. I need to be out there, on the water. You know. Boldly going. I'm trying to connect Farron at Beta Marine in NC with my mechanic on City Island to discuss mounts, connections, transmission, etc. By the way, Farron at Beta Marine USA has taken the term customer service to a whole new level. Drawings, details, email conversations, phone calls, etc. - never once pushing me to buy the engine - in fact, helping me troubleshoot what could be wrong and options for keeping the existing one. If you're ever in repower mode, whether you go with Beta or not, this man is a wonderful resource for information. I'm very close to pulling the phaser trigger and buying a Beta 30. Will let you know how it goes. All the best, Edd Edd M. Schillay Starship Enterprise C&C 37+ | Sail No: NCC-1701-B City Island, NY Starship Enterprise's Captain's Log<http://enterpriseb.blogspot.com/>
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