... or baloon a cylinder

 

okay Im very confused hear, bent rods , balloon cylinder?
what are all these
bent rods because i turned the engine backwards or because I did not take the plugs out ?

at one point when I was turning the engine for the 5th or 6th time a little before TDC mark it always became hard to turn then it seemed like something got relived then it continued turning but this time at the same spot it was really hard and it went kaboom before it got to turn again, maybe the piston got so pressurized that it damaged the gasket ????
if the rod is bent what are the symptoms ? would the engine even run ?

 

Take a deep breath and re-read the thread. Have you pulled the plugs and see if there are coolant on them? Remove all the plugs and let us know what you find. Rotate the engine (with no plugs) and listen for any weird noises.

For the coolant on the floor, the radiator hoses has to be very tight otherwise they will leak. I usually tight them with a big screwdriver and them I use a wrench to tight it somewhat more. Seems if I don't use the wrench they will leak.

 

I will pull the plugs tomorrow.
But the coolant was coming from the exhaust tip along with allot of smoke. enough smoke that if you were passing by you would think a jungle is on fire.

 

If the cylinder fills with fluid it cannot be compressed and can do all sorts of damaged so taking the plugs out avoids the possible condition.

Also turning the engine backward is a no no...........dont do it as other damage to the valve train can occur.

Pull the plugs and look for coolant on them then try pressurising the cylinders or the coolant system to attempt to source any leak. Did the car consume coolant from the tank when it was running? Is it possible coolant got into the heads when you had the intake off?

 

There's a possibility than the cam timing belt can jump teeth on the cam and/or crank gears when turned backward resulting in bad valve timing. If you double checked the timing after reinstalling the balancer and torquing the crank bolt all should be good.

What's B12 and how much was used? That's whats will fill the cylinders and if not burned will be forced out the exhaust. Before we jump to all sorts of conclusions pull the plugs and see whats on them (B12, coolant or what). With the plugs out, all of them, pull the fuel pump fuse and crank the engine over in attempt to push any fluids out of the cylinders.

Let us know what you find.

 

The most likely damage from turning the engine backwards is that the increased pressure might collapse the Belleville washers in the tensioner, which would result in a very loose timing belt, which would result in skipped teeth on the timing belt, which would result in bent valves.

As has already been suggested several times, I would recommend that you remove all eight spark plugs, inspect each of them for traces of coolant, then spin the engine on the starter and check for traces of coolant coming from one or more spark plug holes. This will tell you whether you have blown a gasket on one or two cylinders, one side, or whether you have coolant in all eight cylinders. If you have coolant in all eight, it very well might not be a head gasket, but rather coolant getting into the intake in some way.

 

thanks for your comments
I will do as you guys said and reply back. do you think I should run the engine a little bit before I take the plugs out ?
B-12 or chem tool is a very powerful cleaning liquid something like break cleaner but much stronger, it says on the can "carb, choke cleaner".
now the belt did not skip I was watching it. I did turn it forward and checked the timing a dozen times it was perfect.


what would happen if the plugs were not taken out during a timing belt change please in detail. I want to learn and other new 928 owners to know.

 

Take the plugs out first, if you can pressurize the cooling system and then turn the engine over by hand and look for coolant coming out the plug holes.

 

Removing sparkplugs is absolutely not necessary for a TB change.

 

Taking the spark plugs out when doing the tbelt project helps when turning the engine over by hand........once the plugs are out and the engine is at the point where the cranks is locked down the plugs should be replaced to prevent 'stuff' falling into the cylinders.

Taking the spark plugs out now will give you the opportunity to see if indeed you have coolant in a cylinder (blown head gasket) or you were a little exuberant with the cleaning solution and it needs to be expelled from the cylinders as described above or it may evaporate. Not knowing the properties of B12 and thats your only issue I'd suggest adding a little engine oil to each cylinder as the chemical may have washed the bores dry.

 

Not taking the plugs out will not cause a head gasket to blow.
Turning the engine backwards may possibly damage some things, but will not cause a head gasket to blow.
Enough water, coolant, or other liquid in the cylinder to hydrolock it will more than likely not cause just a blown head gasket.
Hydrolocking will be much more likely to do other damage, like bend the connecting rod, break the piston, or break the cylinder wall.

If you have coolant coming out of the exhaust, there are only a few ways it can be getting into the cylinders. Those would be through the intake somehow, head gasket failure for some reason, a cracked head, or a broken cylinder.

Yes, the engine may run with a bent connecting rod. It may also run with a blown head gasket, broken piston, cracked head, or broken cylinder wall.

It can be very hard to diagnose or speculate on what's wrong over the internet without more information, but based on what's in this thread so far, if you have that much coolant running out of the exhaust, I'd say you'd be very lucky to get away with just a blown head gasket.

 

If you are going to turn the engine over with the starter, Remove the coil wires at the coil before doing so. You do NOT want B-12 shooting out of the plug holes and catching fire from arcing plug wires.

If I were to be invited to the project at this stage, here is how I would begin:

1. Remove plugs
2. CAREFULLY hand-turn engine to #1 TDC and check timing marks on cams, ready to stop if excessive resistance is felt.
3. If cam timing looks OK, crank engine while watching for fluids exiting plug holes.
4. Choose next course of action depending on what I see in above step

 

Well, whatever has happened, at least we know it's our fault.

 

Who would have thought to warn against filling your cylinders with liquid then trying to turn the crank?

I guess if you douse yourself in gasoline and set yourself on fire, we are to blame since we didn't specifically advise against it?