1976 Engine Rebuild

[ekvh]

I am thinking that an early Honda car (1200 cc I think) has 72 mm pistons like the 1000 model. Never did I, but fairly sure this is what others have done.

Available now: https://www.ebay.com/itm/HONDA-GL1000-PI ... 0B&vxp=mtr

 

[bronko37]

Well we finally got the motor split apart! Took some thought and had to make a couple things, then wait for the weather to warm up a bit. We got it done last night. Let me tell ya, there would have been no way to split it apart without a rig like this. We had to put quite a bit of tension on the boards and heat the seem along the bottom edge of the block with a heat gun. When it finally have the bottom seem opened up about 2". Thats a lot of tension. Anyway, enjoy the pics. I hope they can help someone in the future.

I will be posting a video showing the pistons and the rings. They all look pretty good though, but I still believe they are the issue. Certainly not froze in place though.

More to come.

Im also not convinced Im the first one inside this motor either.

 

[ekvh]

Clever

 

[mcgovern61]

Did you find gasket sealant around the base? That sure was a lot of pressure! I have split two cases here and both only took a little bit of tapping and a wooden wedge to come apart.

 

[joedrum]

great going bronko ...looks like i envision it and then some ...very nice .... k:

 

[bronko37]

There was some sealant around the base. There was very little on the front seam of the motor, which is why I believe the oil leak I had was actually leaking from the split line of the engine. I had replaced the cam seals and the crank seal and was still getting oil inside of my belt housing area. I thought perhaps it was the seal but I have installed 100's of seals. I now believe it was leaking on the split line. So worst case scenario, I will fix that... :smilie_happy:

It did take way more pressure than I would have thought to get that engine to split. Although, the front of the motor began to split very easily, lack of sealant. But boy howdy was it stuck along the bottom...

 

[dan filipi]

Nice rig.

 

[bronko37]

Best part about it is I now have a tool that can be used again, like so many of the tools we make for working on our wings.

 

[Denver]

That,s yet another GREAT example of using of what's around, :yes: then your left with another tool, in your bag of tricks when done, nice work! :good:

 

[canuckxxxx]

That is a great case splitting rig. Heat was a good idea too...never thought of that.

 

[julimike54]

Nice tool!

 

[Ansimp]

julimike54 » Sat Jan 16, 2016 7:08 am[/url]":3dno001h]
Nice tool!

+1 :good:

 

[bronko37]

Enjoy some pictures of progress...

 

[bronko37]

The piston rings look surprisingly good, but that doesn't mean they are ok. The definitely show wear in the end gaps. All the gaps are pushing .030" which is the service limit. If that gap increases it means that the od of the ring has decreased. I believe at some point this motor got way too hot. It explains the oil leak on the case split line, the blown head gaskets I had, the low compression and warn rings, and I believe the cylinder walls are "glazed". This is preventing the rings from sealing properly. Also the oil controll rings were all kinda stuck a bit. I believe a good honing and fresh rings allowed to bed properly is just what the doctor ordered.

 

[bronko37]

The video as promised. Enjoy... opcorn:

https://www.youtube.com/watch?v=ji3dlOk7wWk



In the video I note the movement of the connecting rod. Since the video I have plasti-gauged all the bearings and find that they are well within spec at .0017-.0020" oil clearance.

 

[dan filipi]

Videos are great. Nice job.

I think the large end gap is normal because as the rings wear that gap increases but yeah, too large and compression is lost. Could be where the low compression is from? Rings certainly look free in the grooves.

 

[joedrum]

nice vid

 

[Ansimp]

+1 looking good :good: opcorn:

 

[bronko37]

Anyone familiar with these rings? Brand h&y

 

[mcgovern61]

I am not a mechanic, but it seems to me the piston skirt has a lot of wear. Did you get a chance to mic the skirts? On my worn out '81 engine, they were way out of tolerance and looked very similar to yours. My bearings were most definitely shot! I had so much movement, you could measure it with a ruler! :shock: :hihihi: