View Full Version : Question about a harmonic balancer and timing

11-03-2009, 07:15 PM
I am trying to set the base timing on my new engine and just had a thought. I installed a 1997 explorer 5.0 in my 91 f-150 and used a new(reman) harmonic balancer for a 91 truck 5.0 mostly because of the pulleys not lining up. I am trying to figure out if the timing marks would be the same for the two engines, one being regular firing order and the other being HO firing order. I ask because I was sure I had TDC on cyl 1 and it lined up with the 0 mark on the balancer but when I put the timing light on it (spout removed) it was running rough at 24 degrees ATC I was able to turn the dist until it was about 16 ATC and it was running better but I ran out of room so I have to pull it and reset it so I can turn it more. Will try and get it to 10 BTC in the morning. Any thoughts?

11-03-2009, 07:17 PM
not sure on the balancer... you sure your distributor isn't a tooth off?

11-03-2009, 07:19 PM
Not sure if the balancer is compatible... But if you got the #1 cylinder to TDC and it was lining up with the 0* mark on the balancer then I'm inclined to believe you're okay.

On a gen 9 with a 5.0 the base timing should be 10* BTDC with the spout disconnected. 24 ATC is WAY off. Are you sure you're checking the #1 cylinder? Front passenger cylinder.

11-03-2009, 07:19 PM
not sure on the balancer... you sure your distributor isn't a tooth off?Also very possible.

11-03-2009, 07:23 PM
or maybe 2?

F 150Cobra
11-03-2009, 07:28 PM
i installed a 1996 Explorer engine in a 1989 f150 i had to use the F150 5.0 timing cover and timing marker from the F150 and the F150 harmonic balancer to get the timing mark to be good

on my carbed engine Base timing is about 12 BTDC deg and full timing is about 34

in your case remove the spout and set base at 10 BTDC

11-04-2009, 10:15 AM
Yea I used everything from the truck engine. Timing cover, marker and harmonic balancer. I think my dist must be off a tooth or two. Im going to go mess with it.

1985 Ford F-150
11-04-2009, 10:16 AM
Sounds closer to two.

11-05-2009, 08:29 PM
Yup, sure sounds like you're gonna re-stab that dizzy.

11-05-2009, 10:48 PM
Yea bro, all 5.0s are pritty much the same setup. Parts all almost all the same for most engines, yea your def a tooth or 2 out. Reset to TDC and pull the cap, and see where the rotor is. Then you will know whats whats.

11-08-2009, 09:44 PM
I set the timing to 10* BTC and the truck starts and idles well but doesn't seem to be developing the power it should. Almost no torque, revs good in neutral but sounds and feels like its bogged down when I pull out on the hwy. I bumped it up to 11* BTC and it has more power but still feels like it has alot less power than the old truck motor did. How far can I push the timing before I get into trouble. I know on an old galaxie I had it felt the same way kinda like it couldn't get out of its own way until my machine shop advanced the timing then she would spin both tires from the stoplight. Everything else is good, its not missing or anything, just lacking the power. If its not timing what else could be robbing power? Fuel pressure good, new exhaust, new injectors, sound great revving in neutral.

F 150Cobra
11-08-2009, 09:56 PM
any mods on the explorer engine?? it should have a Gt40P heads and the same cam as an 1995+ F150's

11-08-2009, 10:32 PM
Has the gt40 heads not the p heads. Only mods are MAF conversion and 3" single exhaust. All MAF stuff from 95 f150 5.0. I used all the stuff from the truck engine, intake, timing cover etc...

11-08-2009, 10:59 PM
You should be able to bump it to 12 or 13 before it pings, maybe even higher. Just experiment with it.

11-09-2009, 08:24 AM
In neutral how is the throttle responce?

F 150Cobra
11-09-2009, 11:09 AM
it should have a lot of power!!.. mine 1996 Explorer engine with Gt40 headers and a mild cam hauls and 14BTDC !! soo your gotta be good too

double chek that timing oh and what trans u got behind it??

11-09-2009, 08:38 PM
I played with the air tube today and reconfigured it. I also built an aluminum box to hold the air filter, k&n cone. Have to fix an exhaust leak in the morning and re-check the timing. I have an E4OD tranny.

11-09-2009, 09:40 PM
How are you intaking air into the aluminum box? Is there an intake duct? Got any pics?

LEB Paul
11-09-2009, 10:05 PM
I think this was already answered, but #1 cylinder is in the same spot no matter the firing order, so balancer should be the same, I would think.

For the timing, like was said just experiment until it feels good, you should be able to hear if it's not running right.

11-09-2009, 10:57 PM
I think this was already answered, but #1 cylinder is in the same spot no matter the firing order, so balancer should be the same, I would think.Unless the key on the crank (and thus the balancer) is in a different position on the two engines, relative to the timing marks on the balancer ring.

LEB Paul
11-09-2009, 11:03 PM
Good point Chris, I didn't think about that.

11-09-2009, 11:47 PM
Yeah I was thinkin' the same thing as you-- then I had to start thinking about what exactly determines the rotational position of those timing marks... The keyway on the crank/balancer ;)

11-10-2009, 07:48 AM
I do have the balancer from the explorer and the old balancer from the truck, I could compare the timing marks relative to the key way and see iif they are the same. Not sure if the pointer on the two mount in the same location though.

Don't have a intake tube for the airbox yet but plan on making one somehow, maybe attach it from the bottom. I just made a box to try an block off some of the heat from the engine and make it suck from the front and driver fender side of the truck. Kind of like the K&N kit but without the $285 price tag for a piece of plastic. I will try and get some pics up of it if I can get it all finished today...

F 150Cobra
11-10-2009, 10:02 AM
the explorer balancer will work with the explorer timing cover and timing marker..

F150 balancer will work with F150 timing cover and pointer you cant mix up the 2.. i had that prob with an Explorer timing cover and pointer with the F150 balancer..