85 2.8l firing order? and what is #1 on dis cap - S-10 Forum
 
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post #1 of 11 Old 03-28-2013, 08:57 PM Thread Starter
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85 2.8l firing order? and what is #1 on dis cap

ok so i changed the plugs and dis cap today I thought i keep the wires stright but guess was wrong. What is #1 on the cap? is it the one even with the pass side hold down bolt, or is it the one before that?

I have gotten all sorts of answers on the numbers and firing order.

right now I have it 6 4 2 driver side.
5 3 1 pass side. 6 and 5 being the front, it almost cranks like this.
on the dis. cap i have it 123456 going clock wise.


Please help I am going crazy I realy wish i could buy a manual for it but im broke. trying get it running good enough to drive daily

thanks


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post #2 of 11 Old 03-28-2013, 09:12 PM
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Re: 85 2.8l firing order? and what is #1 on dis cap

1 is the passenger front.

Firing order is 1,2,3,4,5,6.

Rear of engine
5 6
3 4
1 2
Front of Engine

Terminal #1 could be any of them.

Best is to get the #1 cylinder on TDC and see where the rotor is pointing.

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Tha toy: 1973 Datsun 240z 12.71 @115
Typhony Old set-up: 1985 GMC Jimmy. 3.2L Turbocharged/Intercooled hybrid. 13.873 @ 99.08 Currently being reconstructed.


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post #3 of 11 Old 03-28-2013, 10:46 PM Thread Starter
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Re: 85 2.8l firing order? and what is #1 on dis cap

I had it hooked like that and got nothing out of it, guess I had the #1 in the wrong spot. How can it be anywhere? I only pulled cap off and put new one back on, well now i have the stock one back on cause thought something screwed up on new one.

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post #4 of 11 Old 03-28-2013, 10:52 PM
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Re: 85 2.8l firing order? and what is #1 on dis cap

It depends on what position the dizzy was installed in, relative to #1 TDC. Since we can not verify that the dizzy has never been removed or replaced, it's impossible to say that a specific terminal is the #1 terminal. This is why I suggested bringing the #1 cylinder to TDC on the compression stroke and seeing where the rotor is at that point.

'Bu: The daily driver
Tha toy: 1973 Datsun 240z 12.71 @115
Typhony Old set-up: 1985 GMC Jimmy. 3.2L Turbocharged/Intercooled hybrid. 13.873 @ 99.08 Currently being reconstructed.


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post #5 of 11 Old 03-28-2013, 11:31 PM Thread Starter
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Re: 85 2.8l firing order? and what is #1 on dis cap

Quote:
Originally Posted by The_Raven View Post
It depends on what position the dizzy was installed in, relative to #1 TDC. Since we can not verify that the dizzy has never been removed or replaced, it's impossible to say that a specific terminal is the #1 terminal. This is why I suggested bringing the #1 cylinder to TDC on the compression stroke and seeing where the rotor is at that point.
OH..... I understand what your saying, Oh crap... I really should had made 100% where #1 was if no other.

Its been way to long, how do i check that? when I took the cap off I noticed the rotor button was pointing to about 7 o clock, if the front of the cap (toward front of motor ) was 12 o clock

so does that mean that is #1 back there? so start there?

"If its too loud,your too old"
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post #6 of 11 Old 03-29-2013, 09:22 AM
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Re: 85 2.8l firing order? and what is #1 on dis cap

Here I will walk you through the steps:
1. take distributor cap off
2. remove cylinder #1 spark plug
3. put a socket and ratchet on crank pulley bolt
4. rotate engine until cylinder #1 is at Top Dead Center You can do this by placing a long screwdriver in the spark plug hole or your finger over the hole
5. then look at the ignition rotor to see where it is
6. mark it on the dist. cap
7. put cap on
8. put plug back in
9. then proceed with placement of the wires per firing order

Gary
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post #7 of 11 Old 03-29-2013, 10:17 AM Thread Starter
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Re: 85 2.8l firing order? and what is #1 on dis cap

Thanks, Sorry about what i said, I was wore out lastnight and wasn't thinking straight. so while the pistion is up on #1 witch is the passenger side front piston. wherever the rotor button points is #1 for the cap. then you just wire it up for 123456
This should be right then, I think Im going to mark my wires today
135 pass side
246 driver side

"If its too loud,your too old"
1985 S10 Blazer 2.8 Auto 4x4
Sony Cd/Mp3/wma Player 2 12" subs

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post #8 of 11 Old 03-29-2013, 11:04 AM
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Re: 85 2.8l firing order? and what is #1 on dis cap

yes but make sure you wire it in the direction the rotor turns.

Gary
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post #9 of 11 Old 03-29-2013, 12:33 PM
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Re: 85 2.8l firing order? and what is #1 on dis cap

Make sure when the #1 piston is at TDC, it's on the compression stroke. The piston will be at TDC twice for a complete cycle, once on the compression stroke and once at the end of the exhaust stroke.

There are a couple ways to check for compression stroke.

One way is to remove the rocker cover and observe that the rockers are both up when the piston is at TDC. This is the best way IMO.

Another way is to bump the engine over using the starter, with the #1 spark plug removed and your finger over the spark plug hole. When the pressure builds, and pushes your finger off the hole, or at least tries to, that is the compression stroke, then you can use a socket and ratchet on the crank bolt to bring it the rest of the way to TDC, aligning the the timing marks between the balancer and the timing tab. This way saves needing to remove any additional parts.

Another and the least accurate way, is to turn the engine until #1 piston is at TDC, and observe where the rotor is. In many cases the #1 post on the distributor will be placed in a direction that will be pointing towards the #1 cylinder, or that general direction anyway. This isn't always true, but it's a generality that seems to be followed by many engine assemblers.

'Bu: The daily driver
Tha toy: 1973 Datsun 240z 12.71 @115
Typhony Old set-up: 1985 GMC Jimmy. 3.2L Turbocharged/Intercooled hybrid. 13.873 @ 99.08 Currently being reconstructed.


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post #10 of 11 Old 03-30-2013, 12:49 AM Thread Starter
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Re: 85 2.8l firing order? and what is #1 on dis cap

Thanks, I got it going today, I didn't have a way to turn over by hand so just took plug out turned by key and found tdc. it was at 7 oclock on dis, pluged everything up and it running great
thanks for the help
Dont do things when your tired as crap

"If its too loud,your too old"
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post #11 of 11 Old 03-31-2013, 12:03 AM
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Re: 85 2.8l firing order? and what is #1 on dis cap

Quote:
Originally Posted by Chris's_96Blazer View Post
Dont do things when your tired as crap
Agreed. Bad idea. I cooked my dash wiring doing just that. When you're tired? STOP!!



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