Air is leaking from exhaust during leak test on lower. What seals are broken?

[noob_boater80]

Lower unit oil is milky white. Plugged lower drain plug and screwed a leak test (with a gauge) hose on the top hole. Sent about 10 psi through the hole and noticed that air is leaking from the exhaust. Confirmed it with soap water. The prop shaft seal is good.

Outboard is a jonhson 50 HP J50TLCRM. Thinking about ordering this and replace all the seals while I'm at it. yay? nay?

Seal Kit Lower Unit Gearcase for Johnson Evinrude 40-75HP 76-88 396355 [BPI87603] - $39.95 : ebasicpower.com, Marine Engine Parts | Fishing Tackle | Basic Power Industries

ebasicpower.com Seal Kit Lower Unit Gearcase for Johnson Evinrude 40-75HP 76-88 396355 [BPI87603] - Seal Kit Lower Unit Gearcase for Johnson Evinrude 40-75HP 76-88 396355This item replaces Johnson/Evinrude (OMC) original equipment part # 396355; GLM # 87603; Mallory # 9-74102; Sierra # 18-2659

bpi.ebasicpower.com

 

[noob_boater80]

I'm assuming the exhaust seal is broken? Number 47 on here: https://www.boats.net/catalog/johnson/outboard/1984/50hp/j50tlcrm/gearcase

 

[noob_boater80]

Going to test it again. What if the bearing housing seals are bad or the housing is cracked..damn

 

[racerone]

Well----Item 47 has nothing to do with your issue !!

 

[noob_boater80]

Well----Item 47 has nothing to do with your issue !!

Then what do you think it is? Going to drop the lower today.

 

[stork55]

bearing carrier o ring,replace the propshaft seals also while you have it apart.

 

[racerone]

No " thinking" or guessing done here.-----Remove lower unit.-----Apply 3 PSI pressure.----Find the leak.----Repair the leak.

 

[noob_boater80]

Does anyone know where i can get or buy a servica manual for this outboard? Searched but no luck

 

[faztbullet]

Only way you would have air leak in this area is carrier o-ring or loose carrier bolt and damaged bolt -o-rings... Here...

 

[noob_boater80]

Only way you would have air leak in this area is carrier o-ring or loose carrier bolt and damaged bolt -o-rings... Here...

Thanks. Gonna see what it is assuming i can pull out the carrier lol

 

[noob_boater80]

Can i removed the bearing carrier housing without dropping the lower unit?

 

[stork55]

yes you can.

 

[noob_boater80]

Crap.. just leaked tested again. The bearing housing is cracked. 3-4 hairline cracks around the inside. Time to bust out the welding machine since this part is no longer available