Yanmar Engine Zincs ??

[ku2c]

Any advise on changing the zinc located on the aft end of the fresh water cooler (6LPA). Is it possible without disconnecting the whole 'cooler'?

The set of zincs I got from Mack-Boring included four 1 1/2 and one 2" and I've been able to change all of them except this one. Got the old one out after disconnecting one of the hoses but the engine/bell housing doesn't give enough room for the new zinc to go in? Am I missing something?

Thanks,

Pete

[SCOOTER]

Pete,

You're going to have to get a little creative, either unbolting or just loosening items until you have the clearance.

[makaira1]

Mine has the same problem. Very poor planning. You should disconnect the aft hose and loosen the clamp brackets holding the cooler. Once the brackets are loosened it allowed me enough room to change it. Good luck.

[ku2c]

Thanks Guys -- going to try loosening the brackets and wiggling. One of the last things do get done before going back in!

Pete

[papi]

I just did my yesterday and went back today and put the whole thing back together. I loosen the two clamps holding the heat exchanger and had to take the fitting off were the short hose is. Of course I lost all the antifreeze, but I was going to change that anyway. I also took the hose going to the exaust elbow and I use that to pull back the heat exchanger and insert the new zinc. I Have the Mack so even if you take out the fish box and come in from the back you are not going to be able to do it.
I'm sure if there was someone there to help me it would of made the job easier. Have fun I had mine already.

Papi
03' Mackinaw
315 yanmar
Sandy Hook, NJ

[ku2c]

Papi,

Thanks - got it this morning as well as the one in the fuel cooler and trans oil cooler. Changed the engine fuel filter and ran the engine. Almost ready to get wet!!

Pete

[pablo222]

[QUOTE=papi]I just did my yesterday and went back today and put the whole thing back together. I loosen the two clamps holding the heat exchanger and had to take the fitting off were the short hose is. Of course I lost all the antifreeze, but I was going to change that anyway. I also took

I had the same problem -- couldn't get enough clearance without
taking off the short coolant hose -- and losing all the coolant.

The next time -- I think I'll take the end cap off the heat
exchanger, and get a nut welded on where it should have
been to begin with.

The heat exchangers are made it Florida. It just seems like a
bad match up.

Also, I'm getting terrible zinc life in the exchanges. Running
gear zincs last about a year. Heat exchanger zincs only
2-3 months.

I'd like to figure that out.

[Tony]

I believe the answer is heated flow, and of course much smaller zincs than used outside the boat. I used to change H/E and manifold zincs monthly on a previous boat. They were pencil zincs in hot locations. Just the nature of the beast.

[Pequod]

I have seen several Yanmar engines whose zincs were not installed properly. The culprit was the use of teflon tape ! It makes for a wonderful insulator.