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Old 06-11-2013, 08:24 AM   #1
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Possible rust in cylinders

My SPG has sat for the past 6 years. I got the engine put back together 4-5 years ago, and when I started the engine, the intake manifold wasn't torqued all of the way, so it pumped coolant through the engine and out the exhaust. (The exhaust manifold had coolant pooling in it).

I re-torqued the manifold and ran it for a few minutes.

I don't remember why but when I moved, I pulled the spark plugs out of it, and it's sat for the past 2 years without plugs.

Now that I have everything to get it buttoned up and running again, I'm worried that there may be rust in the cylinders. I can rotate the flywheel partway back and forth, so the pistons have some free movement within the cylinders.

What is the risk in firing it up as is, or should I pull the head to inspect the cylinders beforehand?

IF there is a layer of rust within the cylinders, what is my course of action, do I need to pull the block to have them rehoned, or can I do that with the block still in the car?
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Old 06-11-2013, 08:56 AM   #2
 
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If it was coolant, there are rust inhibitors that will help a bit. For peace of mind, squirt some WD40 down into the cylinders, rotate the crank by hand a few times, then button it back up...

For even more peace of mind, pull the head....

EDIT: or buy/rent a borescope...
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Old 06-11-2013, 11:40 AM   #3
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Marvel mystery oil down the cylinders.
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Old 06-11-2013, 03:36 PM   #4
 
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Marvel mystery oil down the cylinders.
That'll work. It's mostly naphtha and should be light enough to slip past the rings when cold.
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Old 06-11-2013, 06:49 PM   #5
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Ok, so after talking to my local indy mechanic, and a couple other car guys who have way more experience than I do, they said just pour some oil in there and let er rip. Any surface scuzz will come off and buff out. It hasn't been exposed to the elements (been in the garage the whole time) so there shouldnt be any issues.

My worries were from talking to another guy who got me paranoid about it.
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Old 06-11-2013, 06:55 PM   #6
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You wouldn't believe what you can get away with.

These are tough engines with a lot of tolerance. Get plenty of MM oil down in the cylinders and crank by hand. Prime the oil pressure with a good battery and the fuel pump fuse out. Let 'er rip.
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Old 06-12-2013, 07:01 AM   #7
 
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Ok, so after talking to my local indy mechanic, and a couple other car guys who have way more experience than I do, they said just pour some oil in there and let er rip. Any surface scuzz will come off and buff out. It hasn't been exposed to the elements (been in the garage the whole time) so there shouldnt be any issues.

My worries were from talking to another guy who got me paranoid about it.
You'll be fine. I had my engine apart for 5 years before I figured out that working on it one night every two or three months wasn't enough...
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Old 06-12-2013, 11:45 AM   #8
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Fired up a couple of C900s that sat for a few years, oiled up the cylinders, they smoked for awhile as it worked its way out.
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Old 06-12-2013, 05:27 PM   #9
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I'm getting older.

"Just run it" is a real maxim these days.

You wouldn't believe what you can get away with...
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