Completed Project Kirby's 1991 Ranger Build Up

[Kirby N.]

Thanks Jaime. I took apart a 94 ranger at the junk yard this morning. I can’t see any marks on the shaft and the holes are the same on the top and the bottom.

I pulled an iac and brought it home. Put the junk yard iac on the truck and it does idle lower, but still at 1300-1600. If I pull the plug, it doesn’t change anything with this iac.

Next I took off the valve cover on the drivers side. Oil is coming up out of the holes in the rockers on the top near the shaft.

I talked to my cousin who was a engineer for ford. He suggested measuring the collapsed slop in the lifters some how. I guess there is a tool for this- to see if the lifters don’t have enough travel.

I checked all the numbers to confirm because maybe I have mismatched parts- 1991 vs 2000- The valves are the same, rockers are the same, lifters are the same, springs are the same, pushrods are the same.

I am ready to pull out the engine- but I don’t know what it would gain me.

It runs fine- only the idle issue. No sputter or backfire. Plenty of power. It just gets loud when it is hot. It is quiet when I first fire it up.

 

[Kirby N.]

Sorry- I didn’t answer all your questions:

The iac I got new is a motorcraft for a 1991. The iac I got from the junk yard is from a 1991.

I don’t know how long I should run it to get the lifters pumped up? I have put about 45 miles on it.

It doesn’t have egr because it is a 91. There are no holes between the throttle body and the maf.

There is a hole in the butterfly and it does close fully.

I think that is all your questions.

Thanks for the help buddy. I’ll read those articles.

 

[Scott B.]

Kirby,

Would you be interested in the Ford Fuel Injection & Electronic Engine Control book? If you are not familiar with it, it covers all EEC-IV systems.

I was going through my bookshelf, and found it. Since I no longer have a Ford, I don't need it.

It is out of print, and this copy is in really good shape.

 

[Kirby N.]

Yeah I would be interested in that. Thanks for thinking of me. Just let me know what you want for it and what shipping costs.

 

[Kirby N.]

So I have been reading and researching all day.

It is wierd that the noise only happens when the engine is warm. It is also wierd that the valves are getting plenty of oil.

I am considering ordering some smith bros longer pushrods. I am thinking for some reason the lifters down have enough travel to take the lash out. I talked to smith bros and they don’t have a process for measuring the lash in the pushrods or anything. I don’t know. It would be a $150 gamble. They can make whatever length for that.

I really can’t think of anything else.

 

[Josh P]

Have you checked the map sensor? Maybe get another one from the junk yard or parts store.

 

[Kirby N.]

Yes- I got map sensor from the junk yard. And I will try that. I also got the connector because one of the tabs was broken on mine and got that swapped.
Broken:

New one:

Also here is a picture of the valve train before the mess of making sure that it is getting oiled:

Everything was so clean back then.

I spent some time on the phone with the machine shop that did my heads. The convinced me that the pushrods wouldn't be too short, only too long. That makes sense to me. When they warm up, they get longer. They milled the head .009 to get out the warp. I dont know if the block was decked at all- can't really say. Wondering if that is enough to over extend the valves and cause the noise when fully warm?

My dad is trying to figure out how to measure and see if the travel in the lifters is getting over extended or under extended (leaving lash).

I dont know what to think- but I am leaning toward shorter pushrods because that is what the machine shop suggested and I can't seem to find another solution. He suggested shimming the pedestals to see if that would fix it- that sounds like a half arse way of doing it, but might give us the info needed to order a set of pushrods.

 

[Josh P]

2.9 rocker arms fit, if you are looking for something adjustable

 

[Kirby N.]

I would need to use 2.9 pushrods too I guess. Maybe there is some info on measuring them and checking if they are correct somewhere though. That might help

 

[Kirby N.]

Lifters are different too- non roller.

 

[Josh P]

I would need to use 2.9 pushrods too I guess. Maybe there is some info on measuring them and checking if they are correct somewhere though. That might help

Use the pushrods you have, just change the rocker arms.

 

[Kirby N.]

The pictures that I am seeing have a ball on the end of the rocker so it would need pushrods to be swapped as well- ball to ball wouldn’t work. The pushrods have a cup on one end.

 

[Brian1]

Did you presoak your new lifters in oil before installing them? Did you compare the new Melling rocker rails to the ones you took off to see if the holes were the same, they had the plugs in the end of them and so on? Maybe they could be leaking pressure off somewhere in the oiling passages and not making it out to the rocker arm tips or as you may be thinking some of the oiling holes are misaligned in the rocker assembly. I don't remember a notch in the shaft, I reused my rocker rails after popping the plugs out to clean them and then reinstalling them very carefully in the same orientation I took everything apart. Also measure the pushrods and see if they are around 5.475-5.480" to rule out the possibility of getting pushrods that were boxed wrong or made incorrectly, etc.

If you haven't torn it down too far maybe give it a little more run time to circulate the new oil through all the lifters. I have heard/read over the years of non-oem lifters being bad out of the box or going bad quickly moreso the sealed power brand and not Melling but that could be an unfortunate possibility.

It is such a bummer something like this has happened after you put in all the work, hopefully you get it figured out quickly and it was just something easy.

couple of decent pics in here of the lifter and rocker assemblies and their oil holes

Rebuilding And Improving A Ford 4.0 Engine - The Ranger Station

Original Article Resource: Motor Trend Tick. Tick. Tick. That’s the sound our Ford 4.0-liter, over-head valve (OHV) engine was making in our 1991 Ford Explorer after 250,000 miles. The Ford 4.0L V-6 engines, built in Germany, are found in Ford Explorers and Rangers through … Continued

www.therangerstation.com

That is the article I wrote for Petersen's 4WOR on my engine rebuild and all my photos. Its a shame Ranger Station felt the need to basically steal it, at least they linked to it at the top but it still drives the numbers down on Motortrends site that potentially benefit me in the long run. I didn't know they did that until I saw the link you posted just now.

 

[Josh P]

The pictures that I am seeing have a ball on the end of the rocker so it would need pushrods to be swapped as well- ball to ball wouldn’t work. The pushrods have a cup on one end.

Yes, I'm having half timers today.

 

[Kirby N.]

Did you presoak your new lifters in oil before installing them? Did you compare the new Melling rocker rails to the ones you took off to see if the holes were the same, they had the plugs in the end of them and so on? Maybe they could be leaking pressure off somewhere in the oiling passages and not making it out to the rocker arm tips or as you may be thinking some of the oiling holes are misaligned in the rocker assembly. I don't remember a notch in the shaft, I reused my rocker rails after popping the plugs out to clean them and then reinstalling them very carefully in the same orientation I took everything apart. Also measure the pushrods and see if they are around 5.475-5.480" to rule out the possibility of getting pushrods that were boxed wrong or made incorrectly, etc.

If you haven't torn it down too far maybe give it a little more run time to circulate the new oil through all the lifters. I have heard/read over the years of non-oem lifters being bad out of the box or going bad quickly moreso the sealed power brand and not Melling but that could be an unfortunate possibility.

It is such a bummer something like this has happened after you put in all the work, hopefully you get it figured out quickly and it was just something easy.




That is the article I wrote for Petersen's 4WOR on my engine rebuild and all my photos. Its a shame Ranger Station felt the need to basically steal it, at least they linked to it at the top but it still drives the numbers down on Motortrends site that potentially benefit me in the long run. I didn't know they did that until I saw the link you posted just now.

I didn't know you wrote that! I have read the heck out of it.

I can confirm the correct pushrod length- that's a good idea.

I did soak the lifters in oil for like a month before installation. I have ran it about 45 miles- and sat there running it like 20 minutes. Do you think that is enough? On the first start up I primed the oil pump by filling it from the oil filter and turning the crank. Then I put on the oil filter and filled the oil pan with oil. Then I turned the engine over without spark plugs like 10 times. Then when it was installed we turned it over a lot in like 20 second intervals with the oil pressure up before firing. When I started it, it was quiet (even the first time) until it warmed up when the valves started making noise.

I didn't see anything that I could mess up in the install of the rockers and rails when I took it apart at the junk yard. I am thinking of shimming the pedestals because I could do it super cheap and see if it works.

Have you ever heard of noise because pushrods are too long?

 

[Brian1]

That should have been enough time but maybe the different oil had an effect on them? I did basically the same procedure and never had a noise on mine but I used 10w30 from the beginning and had Lucas assembly lube on the bearings and rocker arm cups/pushrods. I did spin the oil pump with a drill and watch for oil to come out the rocker arm area before I buttoned up the valve covers while it was on the stand.

If/When you shim the rocker rails just be sure to account for the oiling holes at the base. Basically a square flat shim with a hole for the bolt and a hole where the oil passage is.

I'm certainly no engine building expert and I cant say Ive heard of a noise from too long of pushrods. Theoretically the hydraulic lifters should account for a small variance in length like the one caused by machining the heads flat.

 

[Kirby N.]

If not pumping up was the issue- wouldn’t they be loud all the time? Why are the quiet for the 10 minutes it takes to warm up if they aren’t pumping up?

 

[410Fortune]

typical ranger station another reason i never went over there

great article Brian!! seriously it has helped more people then you can ever imagine
You can sleep good at night knowing good karma is coming your way

 

[Scott B.]

I replied to the PM asking a question (your address to ship the book to!)

I assume you haven't been on your computer all weekend.............

 

[Kirby N.]

I tried a few things tonight. I went ahead and ordered some shims. .010 thick and I got oversized ones for the middle pedestal. These would not be permanent solutions, just to see if my pushrods are too short.

My dad wanted to try to figure out the collapsed lifter height and how close the pushrods are landing to center of that, we tried with some feeler gauges and tried to collapse 2 lifters after getting it to TDC. It didn't work.

So I put shims under the rocker pedestals, put the thing back together and it was quiet for a long time. I was really happy. Then as it got hot, like after 30 minutes or so- the sound came back. Its colder today and maybe the shims helped a little.

One interesting thing- I got a mechanics stethoscope and it seems like it is only the drivers side, but seems like most if not all valves.

I was also going to try 3 shims for .030, but when I tried to bolt down the rocker assembly one bolt stretched and broke!! Luckily it came out of the head easy.

All that to say, I didn't get to try .030.


I also hooked up a oil pressure gauge and it seems the melling high volume pump is working well.

Here it is cold:

Here it is hot:

so 55 cold and 35 hot.


I also tried the junk yard MAF and it didn't make a bit of difference on the high idle. I am not sure what to do with that.


Last thing, I ran across this thread: oil and oil pressure

I had seen it before but I kind of wrote it of because I am using a stock cam and this was with a modified cam. However, @jd4242 was having the EXACT issue I have and the exhaust valves look really really close to the spring and spring retianers on mine- and maybe they are only making contact when it warms up. Check out post #51. I ran across it after the .030 shims were installed, so I didn't think I had a good look at them- but I think there is a really good chance that the rockers are making contact with the spring retainers. I have literally been praying that is the issue because I would be so relieved to find it.

Tomorrow I am headed to the junk yard to grab another bolt for the rocker pedestals. I think i might also grab a set of pushrods and a rocker assembly. I wish I could find a NOS ford one.