No start and I am stumped

[fast 99]

@germando ......Not what @fast 99 said........... Crank dot at 12.................. CAM DOT at 6.........BOTH dots at 12 is WRONG

what? not what I said?

 

[xm20k]

Cam was installed with both dots as 12. The distributed dropped in at number 1 and also rotated 180 and dropped just to eliminate it being off

While cranking the engine doesn’t even try to start, just keeps cranking


G

Your cam is off it should be dot to dot crank at 12, cam at 6, dissy at no 1 this is why it isn't firing. I bought a 82 C10 about 15 years ago for $500 because a guy thought the engine was junk and when set on no 1 the cam timing was wrong, I flipped the cam dot to dot and it fired right up. luckily these engines will spin over without mashing valves (extreme race builds not withstanding) this could have been a very bad deal for some other engines.

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[idahovette]

what? not what I said?

Yeah my bad .I meant that's NOT what you said @fast 99 when he said 12 and 12......OK? sorry wasn't real clear

 

[xm20k]

12 and 12 while crank is tdc on no 1 cam and distributor are set at no 6

 

[fast 99]

It's wrong, but wouldn't it be "right" after one revolution of the crank, making the distributor off 180°?

I might be talking out my butt, running on 4 hours sleep right now

Timing marks are usually lined up across from each other. Could be done the other way but not sure why anyone would do it like that.

 

[xm20k]

Timing marks are usually lined up across from each other. Could be done the other way but not sure why anyone would do it like that.

I have only ever seen it done dot (12) to dot (6) even on race motors with gear drives and belt drives. I've always done it this way and then marking the timing tab to the balancer were ever they end up at this point, advanced it 15-20 and stabbed the dizzy in dead on no1 on the cap and they almost always fire instantly. Then adjusted from there.

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[Rustisbest]

Pic is of an SBC but BBC is same

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Post 3

Cam / Crank timing on 454 - CorvetteForum - Chevrolet Corvette Forum Discussion

C3 Tech/Performance - Cam / Crank timing on 454 - I Installed a new cam in my 454. #1 piston on TDC, installed the cam and timing chain. put it back together and it fires but runs all bad. Looked at the distributor and when the balencer is on 0 and number 1 cylinder is TDC, the rotor is pointing...

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Post 2

Cam timing, dimple alignment - CorvetteForum - Chevrolet Corvette Forum Discussion

C3 Tech/Performance - Cam timing, dimple alignment - I installed a new Cam in my motor. Its a stock replacement from Crane for my 71 LT-1. I also replaced the timing chain while I had everything apart. I have #1 TDC (or extremely close). My cam gear and crank gear dimples are lined up and I have...

www.corvetteforum.com

Post 3

https://www.chevelles.com/threads/bbc-both-cam-crank-gear-timing-marks-at-12-00-correct.222081/

 

[xm20k]

That image is confusing no timing set I've ever seen in my 30+ years of messing with GM engines has 2 dots on the cam gear.

I've seen crank gears have multiple dots but that's because they have multiple keyways for advanced/retarded timing setups.

 

[Rustisbest]

It doesnt say it has 2 dots. Think about it. The cam turns 1/2 the speed of the crank. If you rotate the bottom 1 revolution the dot winds up in the same place but the cam dot moves to straight up. Its only where you drop distributor in. Thats why its common for people to be 180 degrees out. 1 and 6 are companion cylinders. Theyre both at the top at the same time.

 

[xm20k]

It doesnt say it has 2 dots. Think about it. The cam turns 1/2 the speed of the crank. If you rotate the bottom 1 revolution the dot winds up in the same place but the cam dot moves to straight up. Its only where you drop distributor in. Thats why its common for people to be 180 degrees out. 1 and 6 are companion cylinders. Theyre both at the top at the same time.

I get that I'm just saying for a lot of people that diagram is confusing more than it helps also, most people by that point have the cover on and won't ever see that relationship.

Especially the guy who has seen the timing set on half a dozen engines VS some of us who've been in there hundreds if not thousands of times.

 

[Rustisbest]

If they're both straight up at 12 you drop the distributor in with it pointing at 1 which is where most people hook the timing light when you fire it.

If theyre at 12 and 6 youre on #6 COMPRESSION or Firing and #1 is on the exhaust stroke. Last time I'll post in this one lol

 

[xm20k]

And what I'm saying is the likely hood of setting it up both at 12 and dropping the dizzy in makes this a high possibility and no amount of flipping the dizzy 180 is going to correct this hence why we assemble dot to dot not 12 and 12. 10 degrees here is what up top 2-3 teeth it's why no backfire as it would if just 180 on the distributor as its even farther off than that.

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Now when most people are at the point of dropping in the distributor, they are in the vehicle with all the tin and balancer on and will fight and fight with this because they will never see it until they pull it apart. Hence the example above of the $500 C10 because he probably did it 12 and 12 and ended up in this position.

 

[idahovette]

Don't care.........been doin' it 12 and 6 for 60 plus years...NOT changing NOW................GET OFF MY LAWN

 

[Rustisbest]

And what I'm saying is the likely hood of setting it up both at 12 and dropping the dizzy in makes this a high possibility and no amount of flipping the dizzy 180 is going to correct this hence why we assemble dot to dot not 12 and 12. 10 degrees here is what up top 2-3 teeth it's why no backfire as it would if just 180 on the distributor as its even farther off than that.

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Now when most people are at the point of dropping in the distributor, they are in the vehicle with all the tin and balancer on and will fight and fight with this because they will never see it until they pull it apart. Hence the example above of the $500 C10 because he probably did it 12 and 12 and ended up in this position.

Yep. Thats a tooth off and not at 6 and 12. And when you rotate the crank 360 it wont be at 12 and 12 either. They did it wrong both ways lol. Way back in post 14 I did say its easier to get off a tooth this way???

Don't care.........been doin' it 12 and 6 for 60 plus years...NOT changing NOW................GET OFF MY LAWN

And that's how I was taught by the old geezer that showed me. But then he also had me to rotate the engine over by hand to where the both dots were at 12 before we put the cover and oil pan back on. Then we just dropped the distributor in with the rotor pointing to #1 that we had marked before we started (just a cam swap). Otherwise it wouldve been 180 out.

Theres more than 1 way to skin a cat!

 

[fast 99]

Everyone has a method that works for them. line the marks up, rotate engine over until #6 valves are rocking it's at TD or within a couple degrees. If an automatic will need to rotate engine anyway to tighten torque convertor. Recheck TDC before stabbing dist.

Some of these late model vehicles dist can't be off as much as a tooth or timing can't be set because other items interfere.