Tdc # 1 ?!!?

[911pcars]

Do not insert anything metal into the spark plug hole and rotate the engine.

You can purchase a compression gauge with a detacheable hose, anything to extend the top of the spark plug hole up to your finger to feel for compression pressure.

Sherwood

[aigel]

Originally posted by banjomike
Even easier than using the compression guage. Pull the spark plug in cylinder 1. Turn the motor to the Z1 mark. Stick a screwdriver into the sparkplug hole. If you hit nothing, turn it around again to Z1 and stick the screwdriver in. When you feel the top of the cylinder you know you're at TDC.

Banjomike:

Even the Dutch flat six is a 4 stroke engine?

Unless your connecting rod breaks, on the four stroke engine, the piston will always be at TDC on the 0 degree crank pulley mark (Z1 on the 911). The question is if it is in the compression or exhaust stroke. Only if both valves are closed when the piston comes up to TDC you call it the compression TDC.

There are 2 revolutions on the crank to do one full 4 stroke cycle while there is only one revolution on the cams to do the full cycle. That's why the crank sprocket for the timing chain is half the circumference of the cam sprocket ...

svandamme:
If that compression gauge doesn't have a valve, just cut the hose and tape it later with electrical tape. Nobody at the rental garage wil know.

George

[enolam]

If your valves are adjusted properely you wont be able to 'wiggle' either rocker at 'overlap'. At TDC both intake and exhaust should be loose.

[svandamme]

little update
set the timing with a compression meter
and the car immidiately puffed a lot better, but still wouldn't run
there was smoke coming out of the tail pipe, so i know something ignited...

so me started thinking ( don't laugh , it scared me ) thursday the mfi was completely wrong so the injection actually happend on the exhaust timing... add up plenty of trying.. = lot's of fuel in the exhaust that can't go nowhere> to much back pressure on the engine , so it can't run

unbolted the muffler
yep , filled with gasoline... so i took it outside , and lighted it
it burned for at least 45 minutes.. so there was lot's and lot's of fuel in there


now the car is resting , no muffler attached, no spark plugs, throttle open so everything can ventilate nicely ( did cover the intake stacks so nothing can fall in them )

with a little luck , tomorrow morning , battery's will be charged over night... the excess fuel will be out of the HE's. the muffler is allready dry and the beast will awaken

[aigel]

svandamme:

Be careful. If you flood the cylinders with large amounts of gasoline, you can bend a rod or cause other serious damage to the reciprocating assembly. Liquid gasoline does not compress well at all.

The other serious problem you have is that gasoline gets past the rings into the engine oil. If the oil is mixed with fuel, it will loose it's lubrication properties. Change your oil before doing anything else.

I have no clue about MFI. You should ask a separete (new thread) question to shed some light on that!

Good luck!

George

[svandamme]

well . i'm in the garage right now
and it certainly doesn't sound like it's flooded no more
big huffs and puffs and smoke from the exhaust

but still not running

it sounds like ignition on the exhaust
if i set it manually to z1, and then trigger my MSD , it fires through the exhaust...but my distributor is spot on z1
and i never disconnected my timing chains ( did do a tensioner upgrade , but i made absolutely sure that the chains didn't move with 4 tie rips per side)

i'll try some more, i'll put the dizzy half a notch earlier and see what happens

[aigel]

You are saying that if you fire cylinder 1 manually with the distributor pointing on #1 you get fire through the exhaust? Then you are off 180 and need to turn the distributor.

Turn it over until the distributor points to the #1 cylinder and the crank to Z1. Then pull the distributor. Turn engine over one time, until you come up on Z1 again. Stick back distributor to still point to #1.

It should fire right up. If it does, change your engine oil.

George

[svandamme]

i've allready tripple checked that my z1 was correct
i'm in utter confusion now and doubt my every previous checks i did.. so yep , i'll give the 180 a try...

[svandamme]

i've had enough of it
now my starter is dead
my battery's are fine , i used an external booster to make sure, and all it does now is click.


i'll drop the engine , and recheck everything from top to bottom

decide to postpone, i can wait till next summer, i don't wanna spend money on a wrench, and i don't wanna stress myself in getting the car to work with halfassed tactics, nor do i wanna break more than my starter...