Monday, November 9, 2015

Subaru EJ25 Madness: Head gasket edition

I was offered beer, and so I took the job.

Everything you hear about what a bitch this is, well, it's true. It wasn't hard, or complicated, but just a shitload of steps. We had the Subaru factory manual and a Chilton's we weren't going to open except in case of emergency.

I don't think removing the motor would've made it any easier. As it was, we had no hoist, and we weren't going to pay to rent one, so screw it. It was pretty tight on the driver's side, but not too terrible. The only thing that was a real cunny was the egr heat riser pipe. We had a flare wrench, but still. Getting the spark plugs out was arguably the hardest part of the job - until we bought a few extra wobbles. We learned our lesson and installed the plugs before mounting the heads.


The fuel lines are easy to confuse. Take lots of pictures.



We were able to put the power steering pump and ac compressor pretty far outta the way. The hood we strapped back a bit to give us room for our large cheater bar.

It was a lot of work just to get to this point.






My favorite shot:


It didn't seem to damage the cylinder wall too badly. I mean, this motor had like 220k on it, so fuck it. It also sat for 18 months after the headgasket blew, so, yeah.



Our hack for holding the pulley: two 3/8ths extensions and a big-ass pry bar.

You can see how close the frame rails were to the heads. We installed the heads with the plugs already in there.

The motor with the intake removed, after we got the damned cams out.We had to acquire an extractor set from Harbor Sheight for two of the cam bolts, but we were lucky enough to be able to file them down and reuse them. We did grab some grade 8 bolts just in case. Whoever the last jackhole inside this motor rounded them for us. He also used the crappy gaskets, which is why we were doing this in the first place. We used Felpro.



I wish I had a shot of the camshafts, bolts, buckets, and shims all laid out with the cardboard box trick. Since we weren't going to mess with swapping shims to set the valve lash, it was imperative that we put everything back exactly where it came from so as to get as close as possible. To do this, we did one side at a time and installed the buckets, shims, and bolts right back where they came from. I gave the buckets a good soak in oil since we didn't have any assembly lube handy.

Full disclosure, the motor doesn't sound perfect - I'm sure we could adjust the lash a bit, but it runs just fine and it already has 500 miles on it as of this writing. To swap out shims on this motor, you either have to pull the cam or use this special tool:


Mistakes, lessons, etc:
When we torqued down the timing belt tensioner, it roated the tensioner clockwise a bit, which was enough to take some tension off the belt. When we went to start it, the timing jumped. I suppose we should've used a new tensioner. We were damned lucky the pistons didn't bump uglies with the valves. Also, note to self: be more sober for the assembly part of the show.

Also, one of the water pump bolts stripped the threads right out of the block. We opted to leave the bolt out rather than trying to make it stay in. I figured some water getting into the timing belt area was less damaging than a loose bolt. We probably should've lubricated the bolt, since it was steel getting torqued into aluminum.










Thursday, October 8, 2015

CA160 Cylinder Studs

Long story short, the CA160 uses two slightly-longer cylinder studs than the CB160 or CL160. This is because of the difference in how these motors mount to their respective frames.

When I rebuilt my CA160 motor, one of these longer studs was stripped and I had a helluva time finding a replacement.

I purchased a parts book a while back, and it has the proper parts numbers and diagram.

Rear-most center pair of studs: 90031-225-000
The other six: 90031-216-000

If you look closely at the top of this ca160 motor, you can see the longer studs.


Here you can see a CB160 motor, and the studs are the same length:


On my CA160 parts book, the studs are 21 and 21A here:



RIGHT:


WRONG:  


Tuesday, October 6, 2015

S90 Exhaust progress

Behold my shitty welding. The makerspace I belong to has a 220v wire welder, so that made it a bit easier to put this together.








I don't know what possessed the previous owner to chop out the battery box. Probably why this bike was only $150. Next time, I'm adding 'unchopped frame' to my list of requirements, right under 'titled'.

Anyway, I lucked into a nice piece of steel that fit the profile really nicely.



I threw this in the vice and bent it up just so a few times.

All the metal I could weld it to was bent all out, and it's impossible to get a damned pair of pliers in there to straighten it.




Looks like I didn't get a shot of the battery cage from inside and the tack welds. Oh well, it needs welded again. I had a look at my CL90 parts frame and the cage goes all the way across to the back and is welded there to give some strength to the frame. I think I'll take a piece of flat bar steel and do that. Not sure how I'm going to weld this in without melting the thin steel. Wish me luck.

Friday, September 11, 2015

S65 Piston Ring Removal

I'm messing around with getting piston rings free. Here are some things I've tried:

Heat (enough to melt the thin sides of the piston
Two-Cycle oil soak
LaquerThinner & Tranny Fluid soak
Muriatic acid soak
Gentle prying (generally the best way to snap them.

What I've noticed from pulling the broken ring chunks out of the ones I get impatient with is that the rusty sticky bits aren't on the back of the rings but rather the sides. So I've been trying to get razor blades and lubricants in those side gaps to free them.

While I was thinking about this I thought, 'what's thinner than a razor blade?' and of course the answer is 'a feeler gauge'. So tonight I'll find a cheap feeler gauge and get started ruining it by sliding it around the ring to try and free it. The next logical question becomes 'what's the size to use?'

Enter the book:

Piston side clearance is 0.015 to 0.045 for compression rings and 0.01 to 0.045 for oil ring. Sizes are in mm.



Now, I'll have to find the same info later for S90 or whatever I'm playing with next week, but I don't NEED this info. It's just nice to know so I can use the largest feeler gauge first.

I don't really intend to reuse pistons OR rings unless I have to, but down the road I may be messing with an old Alstate motor where spares are not just hard but impossible to come by. Plus it's just nice to fuck around sometimes and see if it can be done.





Wednesday, August 12, 2015

S90 Exhaust

I cut off the mount from the white piece, leaving plenty left over. I'm hoping to get some practice in with my new wire welder before I do this for real.




So long, rest of the metal. Maybe someone wants you, somewhere else...












Trying to find a place I can measure from.






This is after grinding and wire-wheeling. I don't trust my welding skills much, so I may add a piece of steel as a backing for the joint.