|T O P I C R E V I E W
||Posted - May 24 2012 : 07:32:37
I've an 86 Carver Mariner - 350 Merc's and the port seawater pump had a leak this spring just before she was splashed. I didn't run her up when the water was dripping becuase I had the water going into my fresh water flush unit and the pressure from the hose exposed the leak. I wasn't able to replace it before she went in so once I found the replacement part (Marineengine.com = 150.00 cheaper than Go2Marine) I did my contortion act and replaced the unit. I then ran the motor and saw great water flow from the exhaust and no leaks. My concern is that I may have missed flushing the transmission cooler that's inline after the seawater pump. When I opened up the seawater pump the impeller was completely destroyed - not a fin left on her - the actual casing had a crack about 1.25 " long on the underside so I know where the water was dripping from but I'm worried that parts of the rubber from the impeller may have been pushed into the system and maybe could have gotten lodged somewhere. The seawater after the Tranny cooler goes into the heat exchanger and then out to the risers and into the exhaust. Did I miss a step? I've never removed the tranny fluid cooler and it looks like a "pass through" flow as it is long and slender like a real fat cigar. appreciate your thoughts! Oh, yes the unit was apparently original so I'll be replacing the other one to be on the safe side in the next week.
|6 L A T E S T R E P L I E S (Newest First)
||Posted - May 24 2012 : 16:39:18
Appreciate the insight - access to the port TFC is excellent so this hopefully will be a minor event. This does make me ask the question - Can you do maintenance on TFC's like you do on a heat exchanger with the internal element?
Going to be a beautiful weekend in OC Md this weekend and I'm hearing the yellow fin tuna are aleady running off shore....thanks again for the info. Ed
||Posted - May 24 2012 : 13:41:58
Rob, exactly, they are like small heat exchangers with many small tubes or passages for cooling.
||Posted - May 24 2012 : 11:44:08
My previous mechanic never properly located the broken impeller pieces when he replaced the starboard pump. I traced the hose from the pump to the cooler and removed it at the inlet side. I reached my finger into the cooler and was able to pluck out all the impeller pieces. I could not see into the cooler because it is almost under the engine. But from feel, it seems like it has many small holes like the heat exchanger. The holes were probably 1/8", and the impeller pieces were all at least 1/2", so no real worries that were able to work thru the cooler.
||Posted - May 24 2012 : 11:15:49
I should be able to remove the Trans fluid cooler easy enough to back flush this weekend - is there some screening or mesh inside the TFC unit that would catch all the rubber? should I worry about the heat exchanger also?
I only ran the motor for about 30 seconds once I had replaced the seawater pump to check for leaks and exit water flow - all looked good.
Actually, I suspect both TFC units are original - although the motors only had 1600 hours on them and had been in fresh water until the last 4 years with me in salt water - I've not had any issues with the trannies (low/lost fluid or burnt fluid smell) - didn't know there was a maintenance/replacement period on the TFC's.
Thanks for the thoughts!
||Posted - May 24 2012 : 10:07:48
How old are the tranny coolers on your engines? If they are older than 8 years, here is a good excuse to pull & replace it.
||Posted - May 24 2012 : 07:57:36
Can you back flush the trans cooler to get the pieces out? that's where they usually get lodged.