Need tip for popping out the Shift shaft bushing on a 79 25 rude.

[Jquest]

I bought this engine like a month back.I noticed some oil coming from the gear case head seal. Thanks to OBJ..I got the seal kit for it. I've taken the unit apart and already have popped out the drift shaft and the gear case head seals. The only problem I have is the bushing for the shift shaft. That thing is flat on the housing and in a bad spot to work on. I thought that by flipping it...I would be able to pop it out with a long 1/4 drive extension, but it's too tight for that. I don't want to maul the housing trying to get at the bushing. Any ideas??

 

[rodbolt]

Re: Need tip for popping out the Shift shaft bushing on a 79 25 rude.

are ya sure its a 79 35? the 79 35 had a propshaft bearing carrier not a bearing head. does your gear case split with 6 screws to expose all the gears ?

 

[Jquest]

Re: Need tip for popping out the Shift shaft bushing on a 79 25 rude.

sorry 25... it splits with six bolts. Already did that and separated the unit. I've replaced all the gaskets. The only problem I'm having is the bushing for the shift shaft so I can replace that rubber gasket and put back the bushing.<br />here...to help you guys.One more question. If that Bushing if fused cause it looks like it's made out of galvanized steel. Is there another way to get it out. I guess a machine shop to drill a hole the same size? THe thing is not coming out. I finally got a screwdriver in there and I bent the head of the drive trying to punch it out.<br />

<br /><br />My unit is a 25953R<br />(40) The busing number is 0304765 <br /><br />Hell is a bushing for an evinrude lower unit that is 30 years old.

 

[BoatBuoy]

Re: Need tip for popping out the Shift shaft bushing on a 79 25 rude.

I'm not sure it's the same engine, but there's a pretty good discussion here on technique: http://forums.iboats.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=28;t=038926#000000

 

[Jquest]

Re: Need tip for popping out the Shift shaft bushing on a 79 25 rude.

yep....same problem I had with mine. It does look like the bushing is made out of brass. I wasn't sure. Anyway....my bushing is hosed. I drilled it in order to weaken it and tried to tap it. Nothing, still stuck. I banged on it through the other side with a screw driver and bent the driver. Now that thread is telling me it's coned shaped. If that is the case....taking it to a machine shop isn't going to help. I guess I'll grab another screw driver and bang it some more. See if it will finally cut loose. <br />Totally bummed out over this little piece. DAMN!<br /><br />BTW...thanks BB.

 

[Walker]

Re: Need tip for popping out the Shift shaft bushing on a 79 25 rude.

I don't think that bushing is supposed to come out. To replce the oring you have to fish it out with small pick type tools and then with care and some blunt tip picks you work the new oring back in.

 

[seahorse5]

Re: Need tip for popping out the Shift shaft bushing on a 79 25 rude.

There is a special tool that is a rod with a "step" in it to catch the bushing and hammer it out to replace the gasket and oring. It is listed in the service manual and in the special tools catalog at a dealer. <br /><br />If the gearcase has saltwater corrosion, it may take some heating and possibly ingenuity to get it removed.<br /><br />It is not tapered, just a press fit.

 

[Jquest]

Re: Need tip for popping out the Shift shaft bushing on a 79 25 rude.

And a ray of light comes through the clouds. I guess heat and rabbit's foot is next. If I pound anymore...I"m scared I'm gonna trash the insides. Thx for all the advise fellas. I'll post what happened...

 

[rodbolt]

Re: Need tip for popping out the Shift shaft bushing on a 79 25 rude.

easist way is to run a 5/16thx18 tap through the bushing, put a bolt in it from the top side and drive it out from the bottom side.

 

[R.Johnson]

Re: Need tip for popping out the Shift shaft bushing on a 79 25 rude.

Listen to rodbolt here, and use some heat. Don't hammer the hole part way shut when installing the new bushing. I can quickly make these removal, and installation punch's if anyone need's a set, that's what I save old drive shaft's for.

 

[rodbolt]

Re: Need tip for popping out the Shift shaft bushing on a 79 25 rude.

nice thing about it is it will actually "knurl" the busing ID and make it tighter again. if you do it correctly the bushing is reusable. it actually works better than the OMC tool.

 

[Jquest]

Re: Need tip for popping out the Shift shaft bushing on a 79 25 rude.

appreciate all the help guys. You guys are the best!! I finally got it out. What happened was..cause of the heat from the exhaust(over 20 years) the part of the bushing that touches the back end of the housing was practically fused. Not even a torch kit was able to help. I resorted to a chizzel. AFter I knocked out about half of the brass bushing...the other half(front part) finally came loose off of the wall. I did scuff up some of the wall. I'll just try to smooth it out and let some 5200 fill any grooves.<br />One thing...IT looks like the brass bushing(bottom end)has space to put in the rubber gasket. Is this correct? Or what happens is...as the brass comes down it squeezes the rubber bushing and does not let it move?

 

[R.Johnson]

Re: Need tip for popping out the Shift shaft bushing on a 79 25 rude.

The brass bushing will squeeze the O- ring around the shaft for an oil tight seal. It will also compress the under gasket for the same reason. You do not want to knurl the bushing, That is the idea of the O-ring. A tight bushing will cause binding of the shift rod. The shift rod will measure .250, the bushing will measure .260 + or -. Don't defeat the reason for this component. The shift rod also has a " dogleg bend in it" That is the reason for the oversize bushing.

 

[Jquest]

Re: Need tip for popping out the Shift shaft bushing on a 79 25 rude.

<br />Gotcha!!

 

[rodbolt]

Re: Need tip for popping out the Shift shaft bushing on a 79 25 rude.

wrong again, but oh well. the OD of the thread is well below the limits.<br /> do what ya wish.<br /> I have only fixed them for a living for almost 30 years.

 

[R.Johnson]

Re: Need tip for popping out the Shift shaft bushing on a 79 25 rude.

Rodbolt: I am not questioning you knowlege here! I have made these bushing from scratch many time's. My first attempt was to make the I.D. with minium clearance. The idea being to make it more leak proof,and longer wear life. It did not work out well. Your experience is impressive with 30 years in the trade. I worked in my first repair shop in 1962. According to my solar powered calculator, that was 44 year's ago. I owned my first OMC engine in 1953, I'm starting to get the hang of how they work.

 

[Jquest]

Re: Need tip for popping out the Shift shaft bushing on a 79 25 rude.

Just one final question. When you guys put back the halfs(upper and lower) of the gear casing. Do you guys use any other type of silicone sealer, along with it? In manaul it show black silicone. I have JOhnson OMC dealer sealer. You know..that brown goop. Is that ok or do a go with a silicone helper around the case?

 

[seahorse5]

Re: Need tip for popping out the Shift shaft bushing on a 79 25 rude.

Originally posted by Jquest:<br /> . Do you guys use any other type of silicone sealer, along with it? In manaul it show black silicone.

I don't know what manual you have, but the factory service manual says to use Type M sealer which is also known as Marpox 1000, Sealer 1000, or 3M type 847. It is NOT a silicone, but more like a brown weatherstrip adhesive.

 

[R.Johnson]

Re: Need tip for popping out the Shift shaft bushing on a 79 25 rude.

Seahorse is right! 1000 sealer is correct. OMC gorilla snot will work, but use it on the retaining screws' also.

 

[rodbolt]

Re: Need tip for popping out the Shift shaft bushing on a 79 25 rude.

R. Jonson, run a 5/16ths tap throuh a worn bushing the measure it . its amazing how close it now resembles a new one.<br /> the fish camp at wash woods hd 13 of the big twin 40's and shift shaft bushings and seals are shortlived.<br />the bushing ID really has no affect on shaft sealing. it will affect the shift cradle. what we did find is if they wore much the OMC tool would drive through the bushing.most of the bushings have a pocket cut in them to contain the oring.<br /> we ran those 40's for many many years on net dories that were beach launched, you would not believe the damage beach launching can do nor how much work under a truck headlight on the beach 30 miles from the nearest aircompressor or shop.<br />we did have a parts cache about 7 miles down the beach, if it was low tide it only took 20 min or so each way, high tide was an hour or more.<br />minor thread Dia average of a class2 5/16thsx18 thread is .255 and the tap drill is ,257. makes the busing a perfect candidate to run a tap in without damaging the function. we tried the 25's and 33's but found the cooling system passages tended to be small and clog with sand.<br />but there was 7 or 8 of those for the smaller dory's. thats how I got into this gig, I hated net fishing and found I could make as much fixing the motors as fishing the nets. that and the art of net mending baffles me.<br /><br /> JQuest,<br /> DO NOT use silicone, it will leak.