How to remove bushings from Yamaha 70B trim sylinder?

[kallehavumaki609]

I have been trying to replace seals from my Yamaha 70B (1989) trim system and having trouble removing the old bushings inside the hydraulic sylinder caps. I have tried with WD-40, screwdriver and hammer but it just does not move at all. Any tips?

Trim system is 6H1-10 and the bushings part number is 90380-16109.

It is this grey thing in the middle. It cannot be pushed from this side.

[fairdeal]

Interesting design.
It seems the bushing is pressed in from the threaded side -
against a 'shoulder'
which prevents it from being directly pressed out.

[fairdeal]

I see also that the bushing is 'split' -

[kallehavumaki609]

Correct. I have been trying to hit it with a screwdriver and hammer from this side. Doesn't work.

[fairdeal]

If I had to get them out -
I would use a Dremel cut off wheel
(might have to wear one down to reduce its diameter)

cut some "slots" into/through the bushing
- maybe 3, evenly spaced -
for a punch to bite into
so it can be driven out

[zenoahphobic]

Surely, if the bushing is split you would carefully pry one side until it slips behind the other side; reducing it’s diameter loosening it’s grip,

[99yam40]

why not just buy a new cap instead?
if they wanted you to pull that bushing out, I would think the service manual would tell you how to remove it.

[kallehavumaki609]

If I had to get them out -
I would use a Dremel cut off wheel
(might have to wear one down to reduce its diameter)

cut some "slots" into/through the bushing
- maybe 3, evenly spaced -
for a punch to bite into
so it can be driven out

Do you mean that I would try to push the bushing with a screwdriver using those 'slots'? I think I can apply decent amount of pressure just under the 'shoulder', 'slots' probably wouldn't be significantly better.

I don't own a Dremel, is there cut off wheel small enough to fit inside the bushing? Smallest I found is 22mm but I would need something like 10mm.

[kallehavumaki609]

Surely, if the bushing is split you would carefully pry one side until it slips behind the other side; reducing it’s diameter loosening it’s grip,

Prying the bushing is very hard, atleast without damaging the cap. I cannot fit anything between the bushing and the cap.

[kallehavumaki609]

why not just buy a new cap instead?
if they wanted you to pull that bushing out, I would think the service manual would tell you how to remove it.

I would prefer using these old ones since they cost around 150€ and if they need to be shipped I couldn't use the boat this week.


There are two types of cylinder caps. The other has a o-ring seal instead of this bushing, and I have found manuals for this version only, not for my version. Original manual book has been lost probably 20 years ago by the previous owner.

[kallehavumaki609]

I got the job done by punching the bushing from this side to make a 'lip' like this (picture) and then hitting the lip from the other side with a screwdriver.

[boscoe99]

I would prefer using these old ones since they cost around 150€ and if they need to be shipped I couldn't use the boat this week.


There are two types of cylinder caps. The other has a o-ring seal instead of this bushing, and I have found manuals for this version only, not for my version. Original manual book has been lost probably 20 years ago by the previous owner.

LIT-18616-00-36 would apply to your model motor. Shows the bush.