72 johnson 25 pushs gear oil out the weep drain hole no water in lower unit ideas ?

[werewolf]

well i thought i had all the small issues done, but i ended up buying a new lower unit case assembly due to finding a freeze crack in the old lower unit case, it came preinstalled new drive shaft seal and shift rod oring with bushing, i replace the case used a new seal kit and left the seals in that came in the new case, got lucky and found it online, i used a air regulator i have and applied 4 to 6 psi to the case thru lower drain hole and it held 6 psi fine, put it on run it about an hour in gear and took it out of the barrel and noticed after about ten minutes there was gear oil mix coming out weep hole where water drains from, so pulled it off, replaced the drive shaft seals with the ones in kit , new case only had one seal, so put new two seals in seal lip down on both seals, ran it again for about an hour still have some gear oil/water mix coming from weep hole, i have a new bushing and oring on the way, is there a way i can save the new bushing thats in the housing ? the last time i had to replace a shift rod oring i used a 5/16 tap and pulled it with a long bolt ruining the bushing , is there another way to take the bushing out ????

 

[racerone]

That is normal drainage , believe it or not.-----That question is asked about 2 times a week here.----Factory had a special tool to remove bushing.------Or I have replaced o-ring without removing bushing too.

 

[Crosbyman]

keep that drain hole open with a piece of wire next time you do the impeller clean out all the lower cavities where crud piles up and blocks the drain

 

[F_R]

It is the same scunge you see floating in the barrel. It is NOT gear oil!!!! It is the oil that you put inn the gas. Put it on a boat on the lake and your perceived troubles will be over.

 

[werewolf]

well this is what i found, the oil in lower unit was low, i had used walmart 80/90 because a guy i know said it would work he said he uses it, i drained what was left and it all came out lumpy not smooth like oil should do, i went and got some synthetic 80/90 at oreillys and filled it up with that, then slowly pressured it up to about 30 lbs until the rubber tip on air blower leaked and no sign of any leaks thru grease i put on seals, put it back on motor ran it for quite awhile until the water in barrel was warm , water stayed clean this time no oil in it, took it out of the barrel been about 40 minutes and no oil or sludge coming out of weep holes, going to run it again in gear just like i just did tomorrow and see if any oil shows up, its looking like that walmart oil is junk to me. , i washed to barrel out before i ran it this time so no sludge was in it. fingers crossed.

 

[oldboat1]

30lbs is good for a car tire, but way too much pressure for an outboard gearcase. I don't think I've heard of lumpy gear oil, but maybe somebody had some grease in there at some point.

 

[werewolf]

oldboat1 ,,,, it is a brand new gear case , its fine now the walmart gear oil was either not very good oil quality or something, and there has never been anything in it untill i bought it, i graually increased the air pressure because i was trying to find out what was going on, i used valvoline i got at oriellys and refilled it after i flushed it out good and filled it, put it back in my barrel with clean water, its now been ran in the barrel for 3-4 hours in gear and still have clean water and still full in the lower unit, it beats anything i ever saw, i looked at another bottle of the walmart brand oil and it looks kinda lumpy looking also, they wont take it back so ill just use it when i burn junk.

 

[oldboat1]

When you pressure test a gearcase, do so with the case drained and with the l.u. removed. Just a few lbs will do. Use some soap spray to identify and locate leaks.

 

[werewolf]

oldboat1 ,,,, i was always told to use about 4 to 8 psi on gearcase but this issue was really odd, , ended up being the wally world oil , thats why i went up on air pressure to see if the brand new gear case might have a defect in it, ive ran it a few times for over an hour in barrel of clean water and no oil loss or any in barrell , it will push the 14 foot john boat with two six gallon tanks and me and gear right at 28 to 29 mph on river so i guess i got a keeper , the 15 johnson i fixed does about 19 to 21 mph on river with one tank

 

[oldboat1]

sounds like all is well.

 

[werewolf]

yeah i think the seal that was in the new housing was old and the walmart 90wt is not very good oil

 

[Geoffrey Graydon]

oldboat1 ,,,, it is a brand new gear case , its fine now the walmart gear oil was either not very good oil quality or something, and there has never been anything in it untill i bought it, i graually increased the air pressure because i was trying to find out what was going on, i used valvoline i got at oriellys and refilled it after i flushed it out good and filled it, put it back in my barrel with clean water, its now been ran in the barrel for 3-4 hours in gear and still have clean water and still full in the lower unit, it beats anything i ever saw, i looked at another bottle of the walmart brand oil and it looks kinda lumpy looking also, they wont take it back so ill just use it when i burn junk.

I have been using the Walmart oil for years in all my motors and have never had a problem such as you describe.I think there must be something else going on here.

 

[werewolf]

Well i have run it a month now and yesterday it started leaking clean oil out of the water drain holes when i loaded the boat i noticed it had clean oil on the fin, so now i'm wondering if somehow the water pump is sucking oil from the seals, both seals are new and seal lip down on both seals , the drive shaft is smooth mic s out fine no wear on it , the lower housing is new with new bushing factory installed in it, i looked the new gear case housing over before i put the parts in it and didnt see any defects in it, i checked the drive shaft diameter with a new one and they are the same size, so its not the drive shaft . im wondering also if someone has the wrong water pump and plate in it ?

 

[oldboat1]

See if it smells like the Valvoline before you tear into anything.

 

[werewolf]

old boat1 ,,,, yes it is its clean gear oil , and its low , i put two seals in the drive shaft hole both with seal lip down , i ordered another seal kit and shift rod bushings so ill have a spare one, im wondering if somehow the water pump is sucking the oil past the drive shaft seals ? all it has is the wear plate and pump housing no gasket , the same as the way the old gear case was, im real tempted to just install one drive shaft seal and the shift rod oring and bushing and see what happens, it held air pressure fine before , it ran a month every day 32 days to be exact with no issues then bamm it started leaking.

 

[oldboat1]

dunno werewolf. If it's clean gear oil on the fin, I would suspect the drain or fill screw gasket -- doesn't sound like it has been contaminated with water. Strong sulphur smell would be present.

 

[werewolf]

oldboat1, yes it is low and the drain and fill and the pivot bolt gasket are all new and tight, when the seal kits get here im going to pull it and see what it looks like under the water pump, ive got new orings and shift shaft bushings for spares, i welded the crack in the old case and i may use it with one drive shaft seal instead of two, im thinking maybe the water pump is sucking oil thru the drive shaft seals because with two seals it puts it right close to the top of the hole, just see when i take it apart . the clean oil was coming out the drain holes .

 

[werewolf]

well i believe i found the issue, i pulled it apart today and found a very small amount of water in oil, also found the shifter bushing had buildup around it and i put about 6 psi of air on it and watched as oil came out around the shift shaft clean oil, i had made a punch out of drill rod and drove bushing out and found it had one whole oring in it and about 1/3 of another in the hole so the guy i bought the [new unused] housing from lied about it, it may have been new but someone tried to use it and left a big piece of the old oring in it, got it back together and going to air test it tomorrow to give the silicone time to set up, went ahead and replaced all seals to be safe. w'ell see i guess if thats it. oil is leaking between the sludge on shift shaft bushing drive shaft seals dry.

 

[oldboat1]

Use BRP/OMC sealant (expensive, but lasts forever) -- comes in a can, or used to.

 

[werewolf]

well i pressure checked it with air and vaccum this time 8 psi and held 21 inches vaccum i used the grey permatex silicone had good usage with it, held fine and had ran it four trips on river so far looks well ,