Hello everyone,
Got my donor model 75 today!
The only problem is that it is stuck in gear, the bronze 'fork' linkage piece is free and rattles around though!
Any ideas?
Jacob
Model 75 stuck in gear
Moderators: John@sos, charlesp, Charles uk, RickUK, Petergalileo
- seagull101
- Posts: 405
- Joined: Mon Jan 23, 2017 10:30 pm
- Location: Scottish islands
Re: Model 75 stuck in gear
Strip it down, clean and inspect, to see what's going on.
- seagull101
- Posts: 405
- Joined: Mon Jan 23, 2017 10:30 pm
- Location: Scottish islands
Re: Model 75 stuck in gear
Yep, the problem turned out to be that the crown wheel was rusted onto the prop shaft, it freed up easy though.
- Charles uk
- Posts: 4954
- Joined: Wed Feb 27, 2008 4:38 pm
- Location: Maidenhead Berks UK
Re: Model 75 stuck in gear
There shouldn't be any water inside that lower unit as it's a sealed unit!
And the crown wheel has a bronze center bush running on a stainless steel prop shaft, so that shouldn't happen.
It might be a good idea to replace both the oil seals with new twin lipped seals, as the original single lipped seals were designed to keep the oil in, not the water out!
And the crown wheel has a bronze center bush running on a stainless steel prop shaft, so that shouldn't happen.
It might be a good idea to replace both the oil seals with new twin lipped seals, as the original single lipped seals were designed to keep the oil in, not the water out!
Make it idiot proof and someone will make a better idiot.
- seagull101
- Posts: 405
- Joined: Mon Jan 23, 2017 10:30 pm
- Location: Scottish islands
Re: Model 75 stuck in gear
Sorry meant onto the clutch dog and slightly corroded onto the prop shaft!
The gasket that was on it was almost completely gone, i made a new one!
Jacob
The gasket that was on it was almost completely gone, i made a new one!
Jacob
- Charles uk
- Posts: 4954
- Joined: Wed Feb 27, 2008 4:38 pm
- Location: Maidenhead Berks UK
Re: Model 75 stuck in gear
Gasket paper 10 thou thick, sorry don't understand clutch dog comment as it's pinned onto the prop shaft.
Make it idiot proof and someone will make a better idiot.
- seagull101
- Posts: 405
- Joined: Mon Jan 23, 2017 10:30 pm
- Location: Scottish islands
Re: Model 75 stuck in gear
I just used a weetabix box for that gasket! I did also use sealant though.
The clutch dog is steel and what i meant is that the steel crown wheel and the steel clutch dog rusted together.
You are definitely right that it leaks because after 5 mins running time the new oil looks horrid!
It also looks like somebody has poorly tried to fix the problem as a home made copper pipe collar was round the bottom of the drive shaft.
The clutch dog is steel and what i meant is that the steel crown wheel and the steel clutch dog rusted together.
You are definitely right that it leaks because after 5 mins running time the new oil looks horrid!
It also looks like somebody has poorly tried to fix the problem as a home made copper pipe collar was round the bottom of the drive shaft.
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- Charles uk
- Posts: 4954
- Joined: Wed Feb 27, 2008 4:38 pm
- Location: Maidenhead Berks UK
Re: Model 75 stuck in gear
The thrust washer between the end cap & the crown wheel is there to set the clearance between the crown wheel & the pinion, these washers wear increasing the clearance, using a thicker gasket will add to this as well.
Both of these factors will shorten the life expectancy of your lower unit, & all of these parts are quite expensive except the thrust washers, gaskets & oil seals!
Both of these factors will shorten the life expectancy of your lower unit, & all of these parts are quite expensive except the thrust washers, gaskets & oil seals!
Make it idiot proof and someone will make a better idiot.