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1984 Bronco build thread

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ArdWrknTrk

Re: 1984 Bronco build thread

Administrator

I think I've joked that Big Blue's dash looked like mission control in Houston back when you were ordering all those specially labeled switches for the medium duty radio bezel.

Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with a Holley 80508 and Performer intake.
Too much other stuff to mention.

StraightSix

Re: 1984 Bronco build thread

Gary, I guess there is nothing wrong with the cab looking like mission control, especially if the cab IS mission control like Big Blue.

I was really into building and modifying guitars a few years ago. My first big project was a built from spare parts Telecaster with 3 pickup, one of which was a humbucker double coil with split-able coils. Oh man, the switchboard on that thing. Push pull pots, 3 way toggle switches all over, a 5 position blade switch that Im pretty sure I bent tabs on the bottom of to modify its operation.. there were dozens of combinations of coils.. and I used about 3. After a month I redid it to simplify down to the combinations I actually used. It was an important lesson for me about the balance between enough options/data/gauges/stuff, and too much.

This ofcourse is highly subjective. I sure would like to know what my oil, air, water, other air, etc temps are going down the road though.

1984 Bronco, mild built 300-6, Np435, 3.55 gears, 8.8 rear with Eaton TrueTrac, D44 TTB front, 31" tires, Duraspark II, Offy C, EFI manifolds, Holley 390, No AC, 3G alternator, front receiver

StraightSix

Re: 1984 Bronco build thread

Hi Guys!
The 500 mile oil change is done, the oil looked and smelled fine. I have the coolant system drained, replaced the thermostat gasket last night. I think that was the source of my water leak, fingers crossed. the coolant also looks good, no crud or oil in it.

the tank has about a 50/50 blend of 89 and 87 in it now, and its running great other than what I think may be a bit of knock just as the throttle plates open. I have 16 degrees of base timing and 16 degrees of vacuum advance, Id think the engine would have ~ 32 degrees of timing more or less in that moment. Im going to dial the base timing back a little today and see if that resolves the problem. If not, Ill probably just run mid grade for a while and not worry about it. of course, Id prefer to burn 87 if I can. I dont have any knock at any other times, so it seems like my High DCR is going to work out.

I received my new vacuum motor yesterday, but unfortunately the metal arm that hooks through the damper door is too short on the new vacuum motor. on the bright side, I did get the old one out by drilling the rivet and I found a small (m4) bolt and lock nut that will serve to replace it. swapping in the new vacuum motor should only take 5 minutes next time.

I just hopped on ebay and bought the cheapest NOS vacuum motor that looked like mine. apparently, that strategy doesn't work. I looked around through the air cleaner documentation but didnt see anything specific enough to identify which vacuum motor I need for an 84' 300 snorkel. I guess I dont even really need one that is application specific, I just need one where the rod is the correct length. mine measures 1.328" from the bottom of the metal plate the rod attaches onto to the outside of the bend of the hook.

any advice to help me avoid playing the "buy, check, no refund" game on ebay would be greatly appreciated. Thanks Guys!

1984 Bronco, mild built 300-6, Np435, 3.55 gears, 8.8 rear with Eaton TrueTrac, D44 TTB front, 31" tires, Duraspark II, Offy C, EFI manifolds, Holley 390, No AC, 3G alternator, front receiver

ArdWrknTrk

Re: 1984 Bronco build thread

Administrator

Do the eBay sellers have the vacuum motors listed by Ford p/n, or Motorcraft #???

I know the one I bought off a Mustang parts site listed both.

Anyway, looking your application up through the diagram and MPC should net you specific numbers that fit your truck's housing.

Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with a Holley 80508 and Performer intake.
Too much other stuff to mention.

Gary Lewis

Re: 1984 Bronco build thread

Administrator

In reply to this post by StraightSix

Excellent progress!!!

The reason you can't find the info about the vacuum motor is that they are shown in the calibration codes. So you have to find the calibration code in order to get the right PN.

Looking at the applications list for 1984 Broncos for a 300 Six I see that there were codes 353, 355, 358, 361, and 364. But you have a manual transmission and I assume you don't have a CA-spec vehicle or the Hi-altitude specs. And that means I should go look at #353 or 355...

And it looks like D7TZ 9D612-B Motor assy, (carburetor air cleaner vacuum) *CX-120 Color code: brown

The CX-120 is the Motorcraft #.

Gary, AKA "Gary fellow": Profile

Dad's: '81 F150 Ranger XLT 4x4: Down for restomod: Full-roller "stroked 351M" w/Trick Flow heads & intake, EEC-V SEFI/E4OD/3.50 gears w/Kevlar clutches
Blue: 2015 F150 Platinum 4x4 SuperCrew wearing Blue Jeans & sporting a 3.5L EB & Max Tow
Big Blue: 1985 F250HD 4x4: 460/ZF5/3.55's, D60 w/Ox locker & 10.25 Sterling/Trutrac, Blue Top & Borgeson, & EEC-V MAF/SEFI

ArdWrknTrk

Re: 1984 Bronco build thread

Administrator

Great information Gary!

Thank you for doing the legwork on this one.

Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with a Holley 80508 and Performer intake.
Too much other stuff to mention.

Gary Lewis

Re: 1984 Bronco build thread

Administrator

Welcome. But, I just had a thought - that info is for an air cleaner that would have come with this truck. But maybe this air cleaner didn't come with this truck? If so then I need to go back and find the right PN for whatever truck the air cleaner came from.

Gary, AKA "Gary fellow": Profile

StraightSix

Re: 1984 Bronco build thread

Thanks Guys, all of that info is very helpful.

I know the engine had been remanufactured before because it had 4.030 pistons. All (or most) of the factory emissions equipment was in place as best as I could tell. I say all of that to say, I cant positively verify the exact origins of the air cleaner other than saying "Im pretty sure its a factory air cleaner, and it looks like the ones in the diagrams for the 82-86 300". It was dressed as an 84' block should have been, feedback carb, TFI ignition, ETC.

1984 Bronco, mild built 300-6, Np435, 3.55 gears, 8.8 rear with Eaton TrueTrac, D44 TTB front, 31" tires, Duraspark II, Offy C, EFI manifolds, Holley 390, No AC, 3G alternator, front receiver

Gary Lewis

Re: 1984 Bronco build thread

Administrator

That vacuum motor was widely used for 300's, 351M's, and 400's so should be easy to find.

Gary, AKA "Gary fellow": Profile

StraightSix

Re: 1984 Bronco build thread

In reply to this post by StraightSix

WOAH. There is one cx-120 vac motor on ebay but it would be ~$70 shipped. Looks like I have more looking around to do.

1984 Bronco, mild built 300-6, Np435, 3.55 gears, 8.8 rear with Eaton TrueTrac, D44 TTB front, 31" tires, Duraspark II, Offy C, EFI manifolds, Holley 390, No AC, 3G alternator, front receiver

StraightSix

Re: 1984 Bronco build thread

In reply to this post by Gary Lewis

Thanks Gary. There are several on ebay for much more reasonable prices listed as "351M" or "400" vacuum motors.

As Jim pointed out, I dont really need one that is application specific in all likelihood. Just one that fits.

1984 Bronco, mild built 300-6, Np435, 3.55 gears, 8.8 rear with Eaton TrueTrac, D44 TTB front, 31" tires, Duraspark II, Offy C, EFI manifolds, Holley 390, No AC, 3G alternator, front receiver

Gary Lewis

Re: 1984 Bronco build thread

Administrator

From what I saw, a whole bunch of 351M and 400's used that motor. But I didn't check to see that all did.

If you have a specific application I can check that.

Gary, AKA "Gary fellow": Profile

StraightSix

Re: 1984 Bronco build thread

Hopefully I can work it out from here. Eventually, one will come up on ebay at a less ridiculous price or Ill make it out to the JY.

Thanks for taking a look through the master parts catalog. I should really consider trying to find one of those..

1984 Bronco, mild built 300-6, Np435, 3.55 gears, 8.8 rear with Eaton TrueTrac, D44 TTB front, 31" tires, Duraspark II, Offy C, EFI manifolds, Holley 390, No AC, 3G alternator, front receiver

Gary Lewis

Re: 1984 Bronco build thread

Administrator

I know of two vendors of the 1980 - 89 MPC - HIPO Parts and David Forel. The one sold by HIPO isn't OCR'd (optical character recognized" and you cannot search it for things. The one sold by Forel is OCR'd, but not well, meaning that less than half of the instances of things I've searched for have been found. (I've told him about that, but got absolutely no response.)

And yes, that does imply mine is OCR'd, very heavily. Contact me offline for how I did that.

Gary, AKA "Gary fellow": Profile

ArdWrknTrk

Re: 1984 Bronco build thread

Administrator

This post was updated on .

In reply to this post by StraightSix

Here's one for $44. with $7 shipping.

It's not cheap, but it is NOS.

Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with a Holley 80508 and Performer intake.
Too much other stuff to mention.

BigBrother-84

Re: 1984 Bronco build thread

This post was updated on .

In reply to this post by Gary Lewis

Gary Lewis wrote

What's wrong with looking like a 747 cockpit?

Simply 'cause, from time to time, 'should take a look at the road.

Jeff / 1984 F350 Crew Cab 4x4/5.8L w351 4V/ T18/ D50 4.10 front/ 8' bed.
Restored 2019-2022.
Nicknamed «Big Brother 1984», due to its soooo-looong shape & nod to George Orwell's 1984 famous novel.

BigBrother-84

Re: 1984 Bronco build thread

I read higher in the thread, maybe already answered but I didn't see it.
So guys, I apologize if asking "again"...
Any advice how to verifîy that the flap is working properly when air temperature changes?

Jeff / 1984 F350 Crew Cab 4x4/5.8L w351 4V/ T18/ D50 4.10 front/ 8' bed.
Restored 2019-2022.
Nicknamed «Big Brother 1984», due to its soooo-looong shape & nod to George Orwell's 1984 famous novel.

Gary Lewis

Re: 1984 Bronco build thread

Administrator

I played with the air cleaner I built for Dad's truck by using my Mityvac and heating the air with a heat gun. That let me watch what the flap did and I could see it worked well.

But other than something like that I don't know that I have a good suggestion. Unless you have a way to measure temps remotely. In that case you could put the sensor in the air cleaner and drive the truck, watching to see what happens.

Gary, AKA "Gary fellow": Profile

BigBrother-84

Re: 1984 Bronco build thread

Jeff / 1984 F350 Crew Cab 4x4/5.8L w351 4V/ T18/ D50 4.10 front/ 8' bed.
Restored 2019-2022.
Nicknamed «Big Brother 1984», due to its soooo-looong shape & nod to George Orwell's 1984 famous novel.

StraightSix

Re: 1984 Bronco build thread

In reply to this post by StraightSix

Hi guys. I need to sit down and write out a full update for you guys. The news is all good, the bronco went on its first mountain fishing trip in over a year last weekend.

My type 9 mirrors are floppy. Is there a consensus on which replacement mirrors are the "good ones"? A particular brand or telling feature, perhaps?

Thanks!

1984 Bronco, mild built 300-6, Np435, 3.55 gears, 8.8 rear with Eaton TrueTrac, D44 TTB front, 31" tires, Duraspark II, Offy C, EFI manifolds, Holley 390, No AC, 3G alternator, front receiver

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