Overheating Problems with my Suzuki DT65

Discussion in 'Powerboats' started by Bigfishtinny, Oct 31, 2009.

  1. Bigfishtinny
    Joined: Oct 2009
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    Location: Australia

    Bigfishtinny Dazed and Confused

    HI All


    I Just bought a small cabin cruiser with a Suzuki DT65 1982 outboard , i took it out for a spin and it got so hot the wires lying on to of the head melted and I presume sorted out. I took the head of and found the corrosion and a small leak... The engine still turns over no problem and seems ok . What are the chances that something like the beraings or driveshaft got damaged? I am in the process of getting the head repaired and just waiting for some gaskets to put it all together again.

    One more thing , where would I ask for some advice on the forum regards to repairs to fibreglass ?


    Thanks in advance
     
  2. CDK
    Joined: Aug 2007
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    Location: Adriatic sea

    CDK retired engineer

    If that really is your location, why don't you ask the wizard?
     
  3. Bigfishtinny
    Joined: Oct 2009
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    Bigfishtinny Dazed and Confused

    not sure what u mean by that CDK
     
  4. tom28571
    Joined: Dec 2001
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    Location: Oriental, NC

    tom28571 Senior Member

    Bigfish,

    Your leg should have had a big yank. It was a pun. Dorothy may be able to help as we only feel like fun this morning.
     
  5. gonzo
    Joined: Aug 2002
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    gonzo Senior Member

    Overheats rarely damage the bottom end, unless you have a melted piston and chunks of metal went down. If the cylinders are not scored, it should be ok. In severe overheats, sometimes you get enough wear that it will use oil after.
     
  6. marshmat
    Joined: Apr 2005
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    marshmat Senior Member

    The last time I had a Suzuki overheat, the head gasket blew and one entire cylinder (exotic lining that can't be honed, rings, everything) was destroyed beyond repair. They're great motors when they work, but hi-tech comes back to bite you if it ever breaks.

    It's unlikely that anything on the crankcase side of the pistons would be damaged by a cooling problem in the head. The fuel/oil/air mix takes care of most of the demands of the bearings, shafts, etc.

    Before firing it up again, it'd probably be a good idea to have the cooling system flushed out and the water pump rebuilt, unless this has been done recently. Even if the water pump had nothing to do with your particular problem, they're notorious for sudden catastrophic failures if neglected for too long. If you need to run the engine on land- even for a second- there needs to be water to this pump, as they self-destruct if run dry.

    When you get back out on the water, make sure to keep an eye on the pisser hole (usually on the aft starboard corner of the outboard) to verify proper cooling flow.... and on many engines (check your manual) there should also be a steady stream of spray coming out the exhaust bypass holes once it's warmed up. A significant drop in either flow means "Slow down to idle- RIGHT NOW- and have the cooling system checked ASAP".

    Re. Fibreglass repairs: From the forum menu, choose "Search > Advanced Search" and enter some suitable keywords, look in the subforum "Construction > Fibreglass & Composite..." where there is already a lot of good info on how to patch up FRP. If you don't find what you're looking for, a new thread in that forum should do the trick.
     
  7. CDK
    Joined: Aug 2007
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    CDK retired engineer

    I will explain in detail.
    This is your 2nd post on this forum where people try to communicate with each other and provide useful advice as best as we can.
    Look at the posts on this thread until now: you have been answered by real humans, living in different locations, all of them being part of the planet Earth.

    Except you, because you are from Oz. People from Oz need not ask us anything, because that is where the Wizard of Oz lives, who has the answers to all questions.
     
  8. Frosty

    Frosty Previous Member

    I dont think the head could get that hot it would melt the wires and short them I think you have 2 probs there.

    If an engine gets that hot it would stop running and before that make horrible pinking noises.

    You have a overheat prob ( no alarms?) and you have shorted wires.

    The shorted wires could have been part of the alarm system.
     
  9. Bigfishtinny
    Joined: Oct 2009
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    Bigfishtinny Dazed and Confused

    Thanks for all your help, I should have the head back in a day or two and once i get all the gaskets will just have to see if it runs or not. The wires that melted were the wires going to the coil i figured they shorted and the engine died becouse of no spark( I hope anyways) I don't think this engine has a alarm it seems to be a model just before they came out with alarm systems (at least i can't see any sensores and it has no lights or gauges) the good news is that i found no water corrotion and only thing i can think of causing this was the damage to the head and head gasket. the impeler is brand new and there was water coming out of the pee hole behind the leg. This model does not have a pee hole on the top of the engine it apperently comes out of the exhaust hole.


    P.s Oz is slang for Australia same as Downunder :) no witches but we do have some looney Politicians
     
  10. Wynand N
    Joined: Oct 2004
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    Wynand N Retired Steelboatbuilder

    Do you have the serial number of the engine? If so, I can give you the year model and see if she has a warning system in the control box - usually Suzuki has a buzzer for overheating and oil system (autolube)
     
  11. Bigfishtinny
    Joined: Oct 2009
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    Location: Australia

    Bigfishtinny Dazed and Confused

    Hi Wynand I'll get the serial number in the morning , it's a bit late here atm.
     
  12. Bigfishtinny
    Joined: Oct 2009
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    Location: Australia

    Bigfishtinny Dazed and Confused

    HI Wynand sorry for the late post , had a hectic week.......

    the serial number on the motor is 6501103305 :confused:
     
  13. gonzo
    Joined: Aug 2002
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    Location: Milwaukee, WI

    gonzo Senior Member

    Melted wiring on overheats is common. Sometimes there is no damage at all. However, that means that after it got way past the "too hot" stage, you kept on running the engine for quite a while.
     
  14. Wynand N
    Joined: Oct 2004
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    Wynand N Retired Steelboatbuilder

    Hi Bigfish,

    Your Suzuki is actually a 1981 model. Here is the factory serial numbers sequence for your model (age) Suzuki.

    1980 Serial: 6501-001001 Model: DT 65EST, DT 65ELT

    1981 Serial: 6501-100000 Model: DT 65ESX, DT 65ELX

    1982 Serail: 6501-200000 Model: DT 65ESZ, DT 65ELZ

    There are three remote controls available on these models and on the exploded parts pics, but no warning buzzers are fitted. However, all 65 hp models after these have warning buzzers fitted in remote control box. Hope this help.

    BTW, I run an DT85 with t/t on my fishing boat and it is an excellent engine and very powerful.
     

  15. Frosty

    Frosty Previous Member

    Overheats I have had experience of normally save them selves by alluminium from the hot piston crown melting and depositing on the spark plug stopping the engine.

    However, Im sure this was'nt a designed safety system.

    You need to determine if the wires were melted due to an ampage overload as I personally doubt that the outside of the head could reach 250 degrees and still be running without noises or loss of power-- the required temp for melting simple automotive wiring is in excess of 250.

    The paint must be peeling off and stained badly.
     
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