evinrude 85 crank wont turn but not seized

[wannabewelder]

Hi all, have a 85hp evinrude with VRO crank won't turn. I pulled heads and #2 and #4 seem to move 1/8" back and fourth but 1&3 won't. Bores are clean, cross hatch good, the pistons wiggle side to side. Was wondering about possible wrist pin jammed in ports or piston ring cracked. Ultimately needs a tear down and check rod sizing in case the previous owner had a pipe on the crankshaft. No rust. Just wondering what I may be getting into?
I was going to drop the foot and check pump (will do impeller anyway) but #3 seems to be the issue. Anybody been there yet? Thanks.

 

[Joe Reeves]

First step is to drop the lower unit to determine if the jamming is due to a lower unit problem or to the powerhead.

 

[F_R]

Hm.m.m, so two pistons move 1/8" and other two not at all? Very interesting. Seems impossible without catastrophic bearing failure. Be sure to let us know what you find.

 

[racerone]

Model # is ??

 

[interalian]

Is this the same motor that was running and made 130lb/hole two weeks ago?

 

[boobie]

Interalian, Please enlighten us about the 130 lb hole ??

 

[racerone]

The poster talked about an 85 HP hydro-electric with 130 PSI in all 4 holes .----Just last week I believe.----So now he has a motor with VRO ??

 

[Joe Reeves]

The poster talked about an 85 HP hydro-electric with 130 PSI in all 4 holes .----Just last week I believe.----So now he has a motor with VRO ??

Leesee now.... with hydro electric, that would be a V4 of 1969 thru 1972 vintage... yeah, that confuses me a bit.

 

[interalian]

Interalian, Please enlighten us about the 130 lb hole ??

https://forums.iboats.com/forum/eng...10678002-1970-evinrude-85-compression-reading

 

[racerone]

It be impossible for the wrist pin to stick in the ports !!-----Water in the lower unit and frozen can jam a motor.

 

[wannabewelder]

Is this the same motor that was running and made 130lb/hole two weeks ago?

Not sure what you are talking about. I bought the motor Nov 17th. I think the only post I wrote was asking for an idea on what comp should be on an 1970 85hp

 

[wannabewelder]

First step is to drop the lower unit to determine if the jamming is due to a lower unit problem or to the powerhead.

Joe, good call. I had jumped the gun in pulling the heads....MAYBE. Lower unit is junk.I should have pulled it first since that doesn't cost anything. I am still left with the question why 2 pistons have more travel 1&2 vs 3&4 just incase I posted incorrectly earlier. They move better now but imo all 4 should have moved the same. Guess I'll dial indicate with foot off.

The last one I did I pulled the lower off to find the impeller was upside down just like I think you were getting at. Then I found needle bearings on top of the piston and parts of block near 3" floating around.
I SHOULD HAVE LEFT THE HEADS ON [this one]....it's probably fine.

 

[wannabewelder]

The poster talked about an 85 HP hydro-electric with 130 PSI in all 4 holes .----Just last week I believe.----So now he has a motor with VRO ??

I found it. Yes. I have 2 motors. The 130psi test was for a vintage boat.
The motor that has seized I posted incorrectly it is a 90hp Johnson with VRO. I tried to find the serial on it unsuccessfully. It is grey, has VRO and I did notice a plastic vent out of the gearcase I don't have onE my 89 Johnson that went bang after somebody put the impeller in upside down (but it was CHEAP), I was hoping to install that gearcase on the new motor.
Thanks again for your help.

 

[racerone]

No vent on a gearcase.----That would be a feed for a speedometer !!

 

[wannabewelder]

No vent on a gearcase.----That would be a feed for a speedometer !!

Vacuum?

 

[racerone]

???----There are some gearcases that supply pressure to a speedometer !!----Not sure why you would think vacuum here.----posting pictures is a good idea too.

 

[Joe Reeves]

Joe, Lower unit is junk.I should have pulled it first since that doesn't cost anything. I am still left with the question why 2 pistons have more travel 1&2 vs 3&4 just in case I posted incorrectly earlier.

There is a point of crankshaft travel where the up/dn movement is at rest with thec/rods moving sideways... very slight but it is there.

 

[wannabewelder]

???----There are some gearcases that supply pressure to a speedometer !!----Not sure why you would think vacuum here.----posting pictures is a good idea too.

The hood seems to be consistent with an 84. When I was looking at the parts schematics I wasn't seeing the plastic nipple on the foot. I'll have another go at it. Lost my mem stick for the camera last month. Should just break down and get a new one.

 

[wannabewelder]

There is a point of crankshaft travel where the up/dn movement is at rest with thec/rods moving sideways... very slight but it is there.

I've done cars for many years, not disputing you but it just seems weird. Plus I don't know how hard the previous owner turned it and with how big a pipe. That being said, we launch it in Black Creek which is 283' above Lake Ontario. Saw too many people die in the Niagara River/ Falls. My boss was one of them but that was from his boat landing on top of him which is different dilemma than stalling. Thanks Joe.

 

[Faztbullet]

Why weird???? Even auto connecting rods does this but only occurs when pistons are at TDC