Dt 140 overheat issue fixed??? 98

[Eshaw150]

So todoy i got all my parts in for the lower unit overheat repair. 1998 dt 140
I replace the waterpump replaced the exhaust rubber and plates and the water tube gaskets and the driveshaft housing do to corosion. There was a spot where the water tube comes through that was croded very badly so i built jb weld around that area and around the ruber and metel plate to block exhast from comming through.

Going to run on the hose tommorow and see how it pees and if it over heats on the muffs and if not gonna take it to the river

 

[dloves82]

Re: Dt 140 overheat issue fixed??? 98

What did the exhaust rubber look like, did it appear to be leaking or anything. I've done everthing but replace the exhaust rubber and plate and on my test run today the motor still overheated. I even had to do the same J B Weld fix you did. New impeller, wear plate and housing. New thermostat, head gasket and water pressure valve but still getting very hot and kicking in the rev limiter.

 

[Eshaw150]

Re: Dt 140 overheat issue fixed??? 98

It looked horrible disengrated bad in many peices. It had rubber all over aven had to take the unit and get two bolts machined out. it was ruff had bad corosion damage i might end uo up having to replace it. But it had exhaust leaking into the water system.

 

[Marion Moore]

Re: Dt 140 overheat issue fixed??? 98

You guys are killing me. I hope you get your troubles fixed. Nothing worse than a pain in the butt problem that persists after pouring a bunch of money into it.

 

[dloves82]

Re: Dt 140 overheat issue fixed??? 98

OK, you're talking about the rubber in the gear case. I replaced that also, sounds like mine was in about the same shape as yours. I replaced the bent stainless plate and aluminum plate along with the drive shaft housing also. It sounds like our motors are in about the same condition. Have you replaced the water pressure valve? After the failed test drive yesterday, I stopped by a mechanic the agency I work for uses for our patrol boats to try and get advise. He doesn't work on Suzuki's but used to have one. His suggestion was the De-Suzuki my boat. I haven't given up yet but I'm getting close. I'm going to pull the thermostat this morning and run it without just in case I got a bad one from the factory. I've been told to check for corrosion behind the exhaust cover. I may try that if my test run is another failure, I don't have much faith it'll be a success.

 

[99yam40]

Re: Dt 140 overheat issue fixed??? 98

It is never a good idea to run with out the thermostat in place even the ones in car motors because it will not circulate the water to all of the areas it needs to without the restriction of the thermostat. I have heard of people putting a washer in place of the thermostat on older small motors but not the bigger ones.

You can test the thermostat easy enough with a pot of water on a stove with a thermometer to see what temperature the stat opens on closes

 

[dloves82]

Re: Dt 140 overheat issue fixed??? 98

Your right about the thermostat, guess I'm just starting to loose my mind over the stupid motor. It'll be alot faster to check it that way versus hauling the boat all the way to the lake anyways.

 

[Marion Moore]

Re: Dt 140 overheat issue fixed??? 98

I saw a thread somewhere on the massive internet where a guy with a Yamaha had water passage problems. He removed the heads, exhaust covers, etc. and scrapped down everything. I don't know what the inside of your water passages look like but from the pictures, he had a serious problem.

If your lower unit has corroded like you say I think there could be some issues inside your water passages. I don't remember all of the posts you have made but imagine you have taken the heads off. That's about the last thing I can think of.

Follow the thermostat lead too. It is supposed to start opening at 104 deg F but the manual doesn't say how wide it is supposed to open. I've done the hot water test several times.

 

[Eshaw150]

Re: Dt 140 overheat issue fixed??? 98

well i run mine on the muffs and peed great. And did not not get hot on the muffs so thursday im gonna run on the river. it ever peed for the little holes in the lower and has never done that before.

And the guy that recomended to de suzuki is stupid thisis just maintince issue and we had a new boat at one time with a suzuki df115 and was the best motor we ever had

 

[dloves82]

Re: Dt 140 overheat issue fixed??? 98

Marion,

When I replaced the head gasket I was into the water jacket. Other than a little build up on the passages it looked clear. I took a wire brush to the passages and cleaned it up a bit. I'm going to test the thermostat tonight after I get thermometer. I thinking of replacing every grommet, bushing and gasket related to the water tubes, probably should have done that already anyways. I can't think of anything else to do.

Eshaw,

I'll be thinking of you on Thursday, I really hope you have a successful test ride. BTW, what river are going out on?

 

[dloves82]

Re: Dt 140 overheat issue fixed??? 98

I've been e-mailing back and forth with a mechanic at Browns Point today and he suggested checking the gasket on the exhaust jacket and cylinder head as well as the seals for the water tubes. He said that most times the problem is on the suction side of the water pump with the symptoms we are experiencing. I've done the head gasket so I guess one more order from Browns Point in in the making.

 

[Eshaw150]

Re: Dt 140 overheat issue fixed??? 98

prob out in the intercoastal off in savannah

 

[Eshaw150]

Re: Dt 140 overheat issue fixed??? 98

took it on the water yester day and had no issue but one. I had a hard time movin g the shifter but i fixed it there. Tookit to wot and no over heat peed good and pumped water good. So im gonna go in about a hour and fish. Ill let yall no the outcome.

 

[Eshaw150]

Re: Dt 140 overheat issue fixed??? 98

Had a great day on the water no problems to report.

 

[Marion Moore]

Re: Dt 140 overheat issue fixed??? 98

Glad to hear!

 

[dloves82]

Re: Dt 140 overheat issue fixed??? 98

Way to go Eshaw, glad someone is having sucess.

I received more parts today and will replace them on Wednesday or Thursday. I ordered all the grommets bushing and gaskets for the water tubes as well as the gaskets and plate for the exhaust chamber. Based on Eshaw's post and the advise from the Browns Point mechanic, I believe replacing the seals on the water tubes is gonna be the ticket.

 

[Eshaw150]

Re: Dt 140 overheat issue fixed??? 98

Good Luck to you

 

[dloves82]

Re: Dt 140 overheat issue fixed??? 98

Just got back from my test run and looks like the problems are corrected. Traveled across Lake Monroe and back at WOT and no overheating. Looks like I had the same problem as Eshaw with the severely corroded area between the exhaust and water chambers. JB Weld saves the day again.

 

[Eshaw150]

Re: Dt 140 overheat issue fixed??? 98

Glad to hear that u got it fixed

 

[Marion Moore]

Re: Dt 140 overheat issue fixed??? 98

I'm very glad to hear you have solved the problem. I would hate for you to have to junk your engine. It has a lot of life left in it.