OMC 120Hp 400 hydromech. Stringer noisy lower gearcase

[ybcoach]

Hi there,
i've just finished a re-seal job on a 400 hydromechanical stringer drive. I do not know if this is normal, but the lower gearcase makes a strange (whining? sounds indeed like a fishing rod mechanisme that is pulled out fast) noise when running. It think it is like the pinion gear running heavy on the forward and reverse gears. I measured the play on the driveshaft and it is about 0.6mm (yes, i'm European) (calculates around 0.025") So it shimm's ok. I read about this could be normal, but as it is the first Stringer drive i'm getting my hands on, i do not know if this noise is normal. The mechanisme shifts nice .
Thanks in advance

 

[superbenk]

Re: OMC 120Hp 400 hydromech. Stringer noisy lower gearcase

I have some of that noise too. Some of it could be from the ball gears. I think it's normal to an extent.

 

[superbenk]

Re: OMC 120Hp 400 hydromech. Stringer noisy lower gearcase

Here's a video of mine running: http://www.youtube.com/watch?v=mS7b9aTGe0M

 

[ybcoach]

Re: OMC 120Hp 400 hydromech. Stringer noisy lower gearcase

sounds exactly the same. So , this is ok ? Thnx

 

[superbenk]

Re: OMC 120Hp 400 hydromech. Stringer noisy lower gearcase

sounds exactly the same. So , this is ok ? Thnx

Keep an eye on the lube in the lower and if it stays filing & water free, I wouldn't worry about it.

 

[ybcoach]

Re: OMC 120Hp 400 hydromech. Stringer noisy lower gearcase

i can see no filing or water in the lower oil,but because of the noise , i did a new job on the drive. Opening everything , checking for play on gears and so. There was no sign of wear on the gears . The play on the drive shaft is as in the book. So i closed it up and put it on the boat. Shifting is smooth and without "cluncks" or "rattle" . To let you guys be part of this , i ran the drive from 650rpm up to 3500 and back. It still sounds like a jet engine . But the gearcase does not heat up abnormal or jams. The oil stays relatively clear, (but some foam)
Enjoy the sound on http://www.youtube.com/watch?v=5TuqeE6q_bM. Let me know something about this .
thnx

 

[79Glastron]

Re: OMC 120Hp 400 hydromech. Stringer noisy lower gearcase

Yes, that sounds just like my 140 OMC that used to live in my `79.

 

[ybcoach]

Re: OMC 120Hp 400 hydromech. Stringer noisy lower gearcase

Currently updating with a merc? Complete with outdrive? Like to see some pictures on the job...

 

[CptTrevor]

Re: OMC 120Hp 400 hydromech. Stringer noisy lower gearcase

YB Coach it has been a while been very sick now I am back and currently working to change the system from 400 to a mer any help you can give or pictures especially how to fix the big hole in the transom without tearing the transom out would be appreciated my transom is solid. CptTrevor