locked up 787, advise?

[HardmanGT]

The motor won't turn over and is locked up pretty good. Pulled the head off and the bores look nice so I'm thinking the rings have rusted up in the bore pretty good. I have had PB Blaster soaking the tops of the pistons and the exposed skirts from the exhaust port. The jugs will wiggle around a bit but the pistons are just keeping them stuck in place.

Any tricks on pulling these jugs?

[maxadrenaline]

You are on the right path. Are you sure it is the rings ? Check so see if there is somthing lodged in your pump jamming up the impeller.

[dghal]

You are on the right path. Are you sure it is the rings ? Check so see if there is somthing lodged in your pump jamming up the impeller.

I Agree

Sounds like the motor is fine since the pistons will move in the bore,,

check the impeller

[96xp-ss]

The jugs will wiggle around a bit but the pistons are just keeping them stuck in place.

Any tricks on pulling these jugs?

So you've taken the 4 bolts off and the jug won't slide off?

[HardmanGT]

The engine is out of the the hull so it's not the impeller. The 4 bolts are out of each jug. The pistons do not move within the bores at all. I can slightly wiggle the jugs around which tells me they are broken free of the base gasket. I have been soaking everything down with PB Blaster for a few days now and have still not gotten them to budge. Even grabbed a block of wood and hammer to rap on the pistons from the top.

The jugs will not slide off

[airbornexp]

I had that happen to me and I had to take it to a shop that had a press cost me $50. Sounds like a locked up bearing

[HardmanGT]

I had that happen to me and I had to take it to a shop that had a press cost me $50. Sounds like a locked up bearing

I was hoping not to have to break the pistons but it might come to that

[dghal]

ok so the motor is out,, really does eliminate pump issues,, I doubt the rings are stuck, I bet the motor was "dry" and the piston skirts oxidized to the bores ( that white chalky stuff )

Using lots of lube down the crowns will help but the rings will seal off most of it from getting to the skirts, can you see anything in the exhaust ports or intake side?

A block of wood shaped to the crown of the piston is best for "wacking" it a couple dead blow hits are better than a bunch smack the crap out of it hits.

Good luck, I had a motor in a Snowmobile do this after it was set up for the summer

[HardmanGT]

ok so the motor is out,, really does eliminate pump issues,, I doubt the rings are stuck, I bet the motor was "dry" and the piston skirts oxidized to the bores ( that white chalky stuff )

You nailed it! The skirts were oxidized and had a lot of gunk build up keeping them stuck in place. The wood wasn't working so I resolved myself to hammering the pistons. Once they started to move a bit I wedged some wood under the jugs and just kept repeating the same process until each jug popped off.

This bottom end seems to be junk, too. Wonderful

[ultramaxracing05]

i had a similar problem, but my engine was hurricane damage flooded and 1 year later here i am, i used acetone and transmission oil on a 1:1 ratio, saved on my WD40 costs, and i also used my airhammer to remove the pistons, while pulling on the jug up, and hammering down