Shark Attack

Ok, this was the second time this is mentioned? How can this be? if all the marks line up how can it be off? One turn of the crank is one turn of the crank... if you are at the TDC mark and the cams are lined up on mark... how can it be off???? I dont get it

Garth S

You are correct: for this to be a factor, the only remote possibility I can think of is if one cam gear was put on bassackwards ..... so the little dimple was in front and the wide notch in back.

Shark Attack

I wish

Fabio421

Yes, they are keyed. But the cam gears make two revolutions for every one revolution of the crank because of they are 1/2 the diameter of the grank gear. So it is possible to have one cam gear that is one complete revolution, or 180 degrees off.

BTW, how did you confirm that 4 cylinders are not "running". You said that you had spark, fuel and compression. Did you start pulling plug wires while running and have no change in RPM? If thats the way you confirmed, I put my money on the cam being 180 deg. out.

Good luck. We are pulling for you to find this problem.

Ted928

If while at TDC both cam gear marks line-up then you are all set.
If only one lines up and you have to turn the crank over by 360 degrees and then the other mark lines up then one bank is off.

the flyin' scotsman

Re-trace the steps here.

The car ran on 4 cyls when you got it, the timing belt was in bad state and the cam timing was off, both cams by 2 teeth each........correct?

This makes me suspect that the PO/mechanic obviously did a poor job of replacing the tbelt, screwed up the cam timing and somehow managed to wreck the belt. You have compression, spark and fuel so it leaves timing.

I'd triple check the cam timing by removing the cam covers while observing the firing order.

Are the sparks plugs wet on 5-8 cyls? Be careful of unburnt fuel in the engine and exhaust system.

Garth S

With due respect, No --- that is bassackwards: the cam gears (48 teeth) rotate at 1/2 the speed of the crank gear (24 teeth) such that the pistons stroke twice for each rotation of the cam = 4-stroke engine.
If the gears are installed correctly and the three index marks line up on their respective indices, the motor is correctly timed.

However, I do agree that this is one unique problem .... wish i could see it in the flesh!

Shark Attack

You have to be joking on paragraph one.

Yes papragraph 2 is how i determined 5,6,7,8 are not running

I think you are going to lose your money

Shark Attack

Yes to #1
Yes to #2 in a big way
Done this 3 times now on number 3. but hey whats one more time!
On number 4 I kinda did this in my own little sick way. I took the plenum off and held my hand over 4 and 5 intakes. 5 would suck than right away after 4 would suck.. thus the fire order goes 5-4.

the flyin' scotsman

So were all on the same 'page':

Shark Attack

Wait a min, doesnt Fabio have a point?

What if my dist was off 180? this could happen on that side as he talks about.....
here we are telling the guy he's full of BS and I think he may have a point

Im wrong, when that mark on that cam gear is on mark, that dist is at number one... regardless, Unless the dist has been pulled.. I better check that

the flyin' scotsman

With the cam timing aboslutely confirmed I'd them move to the next timing..........ignition.

Physically follow each HT lead from the disti cap to the respective spark plug and ensure all's good. Inspect the rotor, cap and leads WYAI for cracks/ tracing.............replace if required.

Shark Attack

yes thats the page

JFCIII

First varify that the crank is on the right stroke. Pull the plugs and make sure that the pistons are following the firing order. When #1 gets close to tdc 3,7,2 should be following close behind.
Then check the left bank cam timming because thats where the distributor is timed off.

Are you getting raw fuel from the exhuast when it does run?

Is it a single rotor distributor or dual. Is there a chance it's the wrong dist?

Mrmerlin

In the first post you said you have equal compression on all cyls so the timing of the crank to valves must be on given this, the next thing you have is fuel since you find fuel from the side with out fire then you mus have fuel, the one thing missing is spark I think that you should check the timing of the distributor to the engine . Try this remove the cap check the direction of rotation get the engine back to TDC then note the rotor position see if it lines up with the notch on the distributor housing, this should be in alignment then slowly turn the engine over by hand and verify that every wire is actually going to where the rotor is pointing, I hope this helps you find this.