Scottg97

Just got done replacing the #1 water bypass pipe and intake manifold gaskets.
I was very careful and stuffed the intake ports with newspaper while I scraped all the gasket and gunk off. Removed all the paper, vacuumed out the ports, ran a magnet through them, and vision-ally checked them.

After reassembled. When checking my timing belt while turning the crankshaft to make sure the cam and crank marks line up. It froze when the #6 piston is in firing position. Will continue with force. (i know ....very bad Scott) but locked up again when it gets to the #6 piston firing.

Did I miss something? (all bolts, nuts, and washers are accounted for)

Any thoughts and help would be greatly appreciated before a complete tear down.

Thanks

Scott

1991 SR5 Pick-up 4x4 3.0 slow

Inferno451

I'd take it apart and double check. Inconvenient, but much more convenient than breaking an engine. Are you sure the cam marks line up correctly?

snobdds

Take out the #6 spark plug and rotate the engine again. It may just be the compression that is making it seem tough to turn.

If everything is accounted for and it sounds like you were careful, I doubt anything fell into the cylinder. The valves only open so much and it would be hard to get anything sucked through the valve opening.

Scottg97

I had already pulled the #6 plug to check for compression. And all the marks are lined
up.

Starting tear down. Fun....Fun...Fun

scope103

There is an "old-trick" that might help. The idea is to blow compressed air into the cylinder with the plug out, with the hope that whatever is in there will get blown out. Or at least rattle around and tell you it's there.

Like all "old-tricks," it's much harder to do than just refer to. You need to get the air to bottom of the cylinder so it is blowing up. So you can't just put the blow-gun to the spark plug hole. You'll need to gin up something with a piece of very narrow vacuum hose (or soda straw?) to guide the air to the bottom of the cylinder, while leaving enough room for the mystery piece to pop out.

Did I mention you need to wear eye protection?

Scottg97

Thanks Scope103....that's sound like a sweet "old-trick". I will give it try.

swampfox

A friend of mine had a washer go down the intake,you could see it when the piston was at the top of the stroke. what he did was to heat it with a torch and then fold the washer over with some small screw drivers, this allowed him to pull it threw the spark plug hole. This was on a Suzuki samurai and it has been running fine for several years now. The point is you don,t always have to pull the head. He did have a torch with a small tip and a lot of patience.

Scottg97

Well I did the blowout as suggested. My buddy had a blow tip with a 2 foot 1/8th copper
tube. Blew out all 6 at their lowest stroke. Nothing.....no raddles, and nothing blew out.
I tore it back down. Nothing I can see in the intakes. (even blew them out). Intake valves seem
to be all in one piece.

Next step before head removal. Borescope.....if I can find one.

a51young

I know this is an old thread, but what was the result?

Scottg97

I ended up scoping it. And there was what was left of a washer in the cylinder. It was pounded on to the piston and I couldn't get it to off. So I ended up pulling the head off. Luckily it hadn't done too much damage and was able to smooth out the dings in the piston and head.

But it was kind of a blessing in disguise. I had had some overheating issues with the truck for sometime. Found out that the local auto shop that had replaced a blown head gasket for me about 5 year prior had used the wrong head gasket completely covering one of the main water outlets.

Put it back together. (with the right gasket) It's been running strong ever since!
Knock on wood!

Scott