snaring sound on DT65

[jvb]

dear Forum,
during winter some silly bastards have obviously thrown some rocks near my mooring - just below surface...
so last week i shredded the prop of my Suzuki DT65. all 3 blades roughly bitten.
so i bought a new one and it ran fine first.

but now i have a strange new snaring sound when in gear. in neutral it runs fine and only shakes frequently when on very low revs.
when in gear it makes a snaring sound, getting faster when boat goes faster.
a couple of days before that i had a soft squeeking sound when in gear and going slow. didnt sound too nice, but also not too bad to worry.

the new snaring sounds very worrying.

it would be great to get advice on what to do.

is there a valve where i can enter oil or fat, or did i kick the shaft or anything mechanical?
i hope its nothing mayor - the DT65 is such a reliable workhorse. would be a shame.

thank you for your helpful advice
jan

[Downhilldai]

Is the propshaft running true?

[jvb]

Originally Posted by Downhilldai

Is the propshaft running true?

yes, boat goes to normal speed. just the snaring gets faster and it just doenst sound healthy.

[Downhilldai]

Originally Posted by jvb

yes, boat goes to normal speed. just the snaring gets faster and it just doenst sound healthy.

No throw in the propshaft?

[jvb]

Originally Posted by Downhilldai

No throw in the propshaft?

sorry for my lacking english.
i guess you mean whether the shaft is warped.
how can i check this?
take off prop and have it running?

thank you for your help!

[Mollers]

Give the bloke a break Bradders. Imagine what "No throw in the propshaft" is likely to throw up when put through Google translate.

[jvb]

well.
obviously it is something more serious.

i went to the outboard garage today.
he said that the suzuki dt65 s basically old and fine if it runs - but if never properly serviced (like mine) and broken (like mine) then better not to be touched.
is this correct?? i felt it is a solid workhorse.

we tried unmounting the heel an immediately broke the two stainless boltheads. then even with sensitivity handled we broke the corroded aluminium casted piece holding the cone seat.
nice 2.

he then offered a brand new 80hp 4 stroke suzuki instead. or to repair it in a couple of weeks.
nice 3.

so i am a complete amateur to engines.
i feel all stainless parts meeting aluminium cast are pretty corroded and likely to break.
i still dont know where the rattling comes from and the mechanic said he guesses that probably under the engine one bearing might be gone. or the shaft itself.


what do you suggest...???
do a training in engine surgery or buy a new one?
where would i get a decent used one - at this time of the year...?
nice

damn that rock...

[Nos4r2]

If you are having that much problem with corrosion,sell it and buy another one. It is not going to be easy to get to the fault without breaking something.

[Downhilldai]

Doesn't sound good. Is the propeller hitting the gearcase?

If that noise is there only when in gear, then you're probably best looking to replace the lower unit with a used one. Repairing the original is likely to cost more than the engine's worth.

The DT65 is a pretty good motor, so would be a shame to scrap it if everything else is ok.

Good luck.

[jvb]

thank you guys,
i managed to unmount the lower unit with some helping heat.
burnt some of the seals but now the reason for the sound is obvious:
the gear set in the transmission lost some teeth.
so on the one hand i am glad to have found the fault - on the other hand i am now trying to get some spare parts.
where should i ask to get the missing parts (attached)?
will they be available from any suzuki workshopp or will it be a disaster to find them online somewhere?
thank you for your help,
jan

[Xk59D]

i wouldn't like to imagine the bill for those bits IF you can even find them new.

i would think getting a used lower unit is going to be the only way to proceed. i'd do some research on what gearcases will fit on that engine and get some wanted adds up. i.e 50-75hp lower units maybe the same? guessing on that but you get idea.

cheers

[Downhilldai]

Try IMS (International Marine Supplies) - they keep loads of old Soozook parts.

[jvb]

thank you guys,
in the end the simplest way was the way to take.
ordered via a suzuki dealer and it was 300£ for all parts. delivery within a day.
mounting will take place tomorrow.
i hope i will manage to put the parts together in the right way... ;-)

thank you for your help!
j

[Downhilldai]

£300 sounds cheap. I rebuilt a DT85 lower unit in 1995 and it cost over £500 for parts then.

If you haven't rebuilt a lower unit before with new gears, then I'd recommend you get a good service manual (preferably a factory one), as it isn't simply a matter of replacing old with new.

[jvb]

Originally Posted by Downhilldai

£300 sounds cheap. I rebuilt a DT85 lower unit in 1995 and it cost over £500 for parts then.

If you haven't rebuilt a lower unit before with new gears, then I'd recommend you get a good service manual (preferably a factory one), as it isn't simply a matter of replacing old with new.

uff, now you scared me.
thought it is just a plug&play.
where would i get a manual and where is the difficulty?
thank you!
j

[Downhilldai]

Your Soozook dealer should be able to supply you with a manual.

The gearset needs to be shimmed to ensure the forward, reverse and pinion gears mesh correctly. You may be lucky with the shims from your old gears, but this is unlikely, in which case, you'll need a set of different thickness shims to go with the new gearset. Choosing the correct thickness is a case of trial & error, using 'engineers blue' to check where the gears mesh with each other, then stripping down & rebuilding with different thickness shims until you get it right. Soozook dealers will have a box of different thickness shims to choose from, but as you're doing the job as a 'one-off', it probably isn't worth your while buying a whole set. Probably worth getting a quote from a dealer/specialist for the rebuild, as it isn't a job to be taken lightly.

[jvb]

Originally Posted by Downhilldai

Your Soozook dealer should be able to supply you with a manual.

The gearset needs to be shimmed to ensure the forward, reverse and pinion gears mesh correctly. You may be lucky with the shims from your old gears, but this is unlikely, in which case, you'll need a set of different thickness shims to go with the new gearset. Choosing the correct thickness is a case of trial & error, using 'engineers blue' to check where the gears mesh with each other, then stripping down & rebuilding with different thickness shims until you get it right. Soozook dealers will have a box of different thickness shims to choose from, but as you're doing the job as a 'one-off', it probably isn't worth your while buying a whole set. Probably worth getting a quote from a dealer/specialist for the rebuild, as it isn't a job to be taken lightly.

thank you for the explanation, this helps.
specialists are all booked these days and i only have an older gentlemen builder trying his best.
the engeneers blue will help and then i hope it all works.
will we need all 3 sets of shims? so# 8,13,23?

[Downhilldai]

You'll need a range of different thickness shims for each of the 3 gears to be certain of getting it right. Sometimes the fwd & rev gears use the same shims - can't remember if this is the case with the DT65. You may get lucky and be able to recycle some of the ones you have, but don't rely on this.

[jvb]

Originally Posted by Downhilldai

You'll need a range of different thickness shims for each of the 3 gears to be certain of getting it right. Sometimes the fwd & rev gears use the same shims - can't remember if this is the case with the DT65. You may get lucky and be able to recycle some of the ones you have, but don't rely on this.

great, thank you for this!
will a service manual do any difference?
tried downloading from the web but it seems they are all fake / costly.

[Downhilldai]

The SELOC manual is pretty good at describing the procedure.