Evinrude 25 HP Lower Unit Seal Strip

[cchildr84]

See attached parts page for reference.

I ordered a lower unit seal kit, Sierra P/N: GLM87619, here from iboats.com for my 81 Evinrude 25 HP E25RCIM. The seal strip, #52 on the attached parts page, seems a bit to thin in diameter. It doesn't fit snug in the channel. According to the service manual, it shows sealant to be applied in this channel at the opening where the gear head goes. Does sealant need to be placed along the entire chanel and then the seal strip placed? If, not I don't see how this strip is going to stay in place. Otherwise it would just fall out when I turned the skeg over to re-install. Your help is appreciated.

View attachment 2684_001.pdf

 

[AlTn]

Re: Evinrude 25 HP Lower Unit Seal Strip

at least enough sealant to hold the spaghetti seal in the channel...if you're using the 3M 847 you can glue it in and set it aside if need be as the 847 will reactivate when new/fresh is applied. I'd suggest to you to use the 847 around the entire gearhead at the area where it exits the case as well as the oring. Also. I use it on the skeg screws <6> threads and under the heads, and some around the pivot screw head along with its oring.

When screwing the skeg back to the gearcase housing I set them finger tight then tighten down the ones at the corners befrore torqueing down the 2 center ones, seems to work better then starting from the 2 inner screws first and working out.

 

[cchildr84]

Re: Evinrude 25 HP Lower Unit Seal Strip

at least enough sealant to hold the spaghetti seal in the channel...if you're using the 3M 847 you can glue it in and set it aside if need be as the 847 will reactivate when new/fresh is applied. I'd suggest to you to use the 847 around the entire gearhead at the area where it exits the case as well as the oring. Also. I use it on the skeg screws <6> threads and under the heads, and some around the pivot screw head along with its oring.

When screwing the skeg back to the gearcase housing I set them finger tight then tighten down the ones at the corners befrore torqueing down the 2 center ones, seems to work better then starting from the 2 inner screws first and working out.

When you say the "o-ring", I assume you are referring to the o-ring on the gear head assembly. Also, speaking of the gear case, I see in the service manual the procedure to align the gear case assembly using a special tool. Is there away of doing this with common garage tools that can be purchased at an auto parts store or home depot or something like that.

 

[cchildr84]

Re: Evinrude 25 HP Lower Unit Seal Strip

Well I heard back from the distributor and nothing diffinitive. They (MarineEngine.com) contacted Evinrude, and Evinrude told them to contact a local dealer. None of the kits, be it OMC, Sierra, Mallory, etc. provide an impeller housing shaft seal with their pump kits. Also, when just looking up the housing, none of the brands show the underside to compare. So I'm leaning towards the design has changed over the years such that the housing seal is no longer necessary. Again, if anyone could confirm or provide some input, I'd appreciate it.

 

[HighTrim]

Re: Evinrude 25 HP Lower Unit Seal Strip

You wont get the impeller housing gasket with a gearcase seal kit. If you want it, it is seperate order from dealer.

The spaghetti seal need 3M 847. I glue in the seal in the groove. Push the seal outwards towards the outer edge of the groove, to ensure it is not too short. Leave 1/16" overhang to but up to the prop shaft seal head. Ensure you cut it square. Also use the 847 on the head o ring, and screw threads. Torque screws to spec.

 

[cchildr84]

Re: Evinrude 25 HP Lower Unit Seal Strip

You wont get the impeller housing gasket with a gearcase seal kit. If you want it, it is seperate order from dealer.

The spaghetti seal need 3M 847. I glue in the seal in the groove. Push the seal outwards towards the outer edge of the groove, to ensure it is not too short. Leave 1/16" overhang to but up to the prop shaft seal head. Ensure you cut it square. Also use the 847 on the head o ring, and screw threads. Torque screws to spec.

So, if I'm understanding you correctly, you are saying place the 847 in the groove of the gearhead the place the o-ring. Is that correct?

 

[HighTrim]

Re: Evinrude 25 HP Lower Unit Seal Strip

Yes. Then I also run a bead along the skeg half before installing it.

 

[cchildr84]

Re: Evinrude 25 HP Lower Unit Seal Strip

Thanks. I put it all back together last night, and now the shift rod will only shift into the three positions (FNR) when the drive shaft is in a particular position. Otherwise it only shifts into forward, or whatever gear it is when you pull up on the shift rod. Guess I'll have to take it apart again and make sure I have all the bearings and washers in the correct position.

 

[AlTn]

Re: Evinrude 25 HP Lower Unit Seal Strip

acetone works to remove the 847 ..if 847 is what you're using...btdt on reopening the gearcase..

 

[HighTrim]

Re: Evinrude 25 HP Lower Unit Seal Strip

Im not really sure what you are asking.

The prop has to be spinning to shift. Spin the prop slowly as you shift. It should spin freely in neutral, lock up when you go into both fwd and reverse.

Maybe Im not understanding correctly though.

 

[AlTn]

Re: Evinrude 25 HP Lower Unit Seal Strip

maybe I misunderstood as well...if you're turning the d/s w/o the lower unit attached to the exhaust housing...2 things I've observed..1. you should have lube in the lower unit to assit in all the sliding functions 2. don't expect it to feel like a "jeweled movement" when shifting by moving the lower shift rod by hand,but as High states you should be able to find FNR and they'll all function

 

[cchildr84]

Re: Evinrude 25 HP Lower Unit Seal Strip

Ok. Well the crankcase isn't completely full of lube, but I did rub lube on each part prior to putting it back together, but I'll go ahead and fill it up. Oh, and yes all of this is being done with the lower unit unattached from the exhaust housing. I have a bottle of Quicksilver High Performance lube. Is that sufficient. But back to the shifting. It would only pull up (Forward), go down (Neutral), and down again (Reverse) once the drive shaft reached a particular point in its revolution. I would spin the shaft, stop try and shift, then spin shaft again and try to shift. So in short it was a stop and go operation. But i'll try shifting while spinning at the same time per you guys' suggestion.

 

[cchildr84]

Re: Evinrude 25 HP Lower Unit Seal Strip

Well, I got it all put back together. Pressure and vacuum tests were good. Everythings seems to be as it should. I have a few more items under the cowling hood I want to replace before I start'er up. Thanks, all for your help.