cylinder heads different temp

[Lat48]

Ok, I got the 115 all put together and it runs good. Now the port side is a lot cooler than the other. Got good flow out of the squirter and water feels cool as the port head. How could the water not be going to the starboard side?

Motor is a 1993 TE115LETS

 

[boobie]

Re: cylinder heads different temp

How hot does the stbd side get ?? Maybe you have a thermostat prob on the port side. What did you do to the mtr ??

 

[Lat48]

Re: cylinder heads different temp

The starboard side gets hot. I resleeved 2 cyl, new pistons, reassembled, and oiled the fuel. I can check the temp, but it is a huge difference from 1 side to the other. Almost too hot to touch. I didn't want to run it long like that.

 

[boobie]

Re: cylinder heads different temp

When you did this repair, did you put new water deflectors in it ??

 

[Haffiman]

Re: cylinder heads different temp

Check the cold side, both ignition and temp functions. A defect in the thermostat (partly open) may even make the stb side run hot. If running on muffs, unbalance is normal, so launch the boat or run in a barrel to properly check the temps.

 

[emdsapmgr]

Re: cylinder heads different temp

The telltale is an indication that the water pump is pumping water-not that it is circulating through both heads. You can run the engine on the hose, then pull one of the large hoses off the side of the thermostat housing to check for water flow-then do the other side. Both should be flowing a lot of water at idle. If water come out of both hoses, that's good-normal. You really need to know just what the temp is of each head. Borrow or rent a laser temp gun. When idling the heads should warm to 143-150 degrees. You did not mention that you replaced both stats during the overhaul-a usual replacement item. Next you need to determine if both thermostasts are opening correctly. Possible one of the stats is stuck open/closed. You may need to pull the hotter head to check to see if the water diverters are intact and positioned correctly. Also possible you may need to pull the head covers off each head to check for debris in the circulating passages.

 

[Lat48]

Re: cylinder heads different temp

Thanks guys. Some good ideas. I did make sure the diverters were good. When I pulled the motor, I didn't fool with the stats. I'm going to start it and check the flow from the hoses first. The side that is heating up is the side that had the damaged cylinders. This could very well be what caused the problem in the first place. Got very little info when I got the boat other than it had 2 bad cyls. If it hadn't been for this forum, I would have been in trouble. Since 1 side is staying cool and the other is getting hot, I am going to replace both ststs anyway.

 

[emdsapmgr]

Re: cylinder heads different temp

Good idea. You'd prefer not to have another failure for the original problem. When you get into the thermostat housing, do a visual check the nylon pressure relief valves also. The can get deformed due to too much heat. Also, check the valve body. There is either a pair of small bleed holes cast into the middle of that part, or a single oval hole (depending on the year). That hole(s) should be open. It lets hot water get to the back of the stats so that they open. I think yours has the larger oval hole. It doesn't plug up as easily as the older dual-hole ones.

 

[Lat48]

Re: cylinder heads different temp

Man! Getting that off was a pain. Still don't know how I'm going to get it back in place with those springs.
The last person to work on this put gasket sealer on the lower hose and connection. Now guess where some of that sealer ended up. The small hole was covered on 1 stat. I've cleaned the stats and both seem to have the same spring force on them. The temps were 140 and 102, and I am running a muff. IF I can get this back on, will try again. Can't thank you guys enough.

 

[emdsapmgr]

Re: cylinder heads different temp

Doing the thermostat housing thing on a bubble back powerhead is really tough. Skinned knuckles and all. You may find that if you loosen up the lower cowling that it will give you just a slight bit of finger wiggle room. The pre-VRO models will get quite a bit of slack from loosening that lower cowl. Not so much with your later model.

 

[Haffiman]

Re: cylinder heads different temp

The 'cold' side with 102 indicates either a not working cylinder or leaking thermostat. Use a timing light and check on each plug lead as well as monitor the spark plugs.