Archive for December, 2012

Happy Holidays 2012

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Hedwig at the Boxing Day Cury Cookoff.

Enjoying two weeks off. Maybe I’ll have an engine back next week to work on.

/Photo by Ryan.

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The Spirit of Granny IV

Making a little progress here. Got all the parts in:

Doesn't look like $800

Doesn’t look like $800

I decided to have the machine shop do the cam bearings. They are expensive and look pretty fragile. While the block is there maybe I’ll have them clean it up and do the freeze plugs. Looks like the rear one needs to come out for the cam bearings anyway.

Much lighter w/o crank, etc.

Much lighter w/o crank, etc.

The oil galley plugs are pretty stubborn but a bit of heat does it.

Out it came

Out it came

Tools of the trade

Tools of the trade

The rear one is about the same in terms of stubbornness

The front one is about the same in terms of stubbornness

In the back of the '92 240

In the back of the ’92 240. Whoops- need to take those last two studs out. More heat.

Off to the machine shop.

The Spirit of Granny III

Well I finally got back to tearing down the B20. The cam nut was pretty stubborn so I had to gently ease it off with the air gun. A small 3-jaw puller drew the steel gear off nicely. Off with the plate and out with the cam, and to my surprise and alarm the front cam bearing looked like this:

sogiii4

DOOOOOOOOOOM!

I looked around on the Brickboard and learned that this kind of failure is actually pretty common. That made me feel a little better. I was thinking about maybe leaving all of the bearings alone if they looked ok, but it looks like my cheap re-ring idea isn’t going to work. SO, on to check the other bearings.

Rods conveniently numbered

Everything in these motors is really well marked. Pretty idiot-proof.

The rod and main bearings all looked pretty good. Not too worn but some contamination and pitting.

Crank surfaces look good

Just to get an idea of how worn things are I plastigaged some of the clearances.

Rod looking good at .002-.0015

Main bearing just ok at .003

These should all be fine with fresh standard size bearings. I could probably have just left them, but while I’m in there…

Shiny, healthy journals

Shiny, healthy journals. Out it comes!

Pretty cool. It's been a long time since I've had one of these apart.

Pretty cool. It’s been a long time since I’ve had one of these apart.

sogiii11

It doesn’t come through in my crappy photo but there really isn’t much wear. No ridge at all- the pistons slid right out.

Those ring pliers are the best $6 I've ever spent.

Those ring pliers are the best $6 I’ve ever spent.

More idiot-proofing- note the four dots.

More idiot-proofing- note the four dots.

Exciting before & after shots of my cylinder hone rebuild. But seriously, I was delighted that replacement stones were available for my 25-year-old hone.

Exciting before & after shots of my cylinder hone rebuild. But seriously, I was delighted that replacement stones were available for my 25-year-old hone.

I used a BRM dingleberry home for my B21 overhaul but that doesn’t fit the B20. It worked great but in retrospect I should have saved my money and used the conventional hone- it works well enough.

Parts are all ordered. IPD and carpartsdiscount.com were again very helpful. With the help of a friend (fiend?) I found a machine shop that appreciates the old stuff. Based on what I’ve read about the trickiness of cam bearing installation, I might have them do that in addition to the head rebuild. It might be cheaper than renting the tool.

Ryan looking contemplative.

Helper-monkey Ryan looking contemplative.

Parts should come in this week so I’ll be dropping things off at the machine shop soon. Taking some time off over the holidays. Maybe I’ll put it back together then.