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DIY Guru
96 Ranger-stock
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637 Posts
Discussion Starter #1
I was sent a head that had recently been done at another shop.
The issues with the head were 0 compression.


What I saw when I opened the box.


Pull the head out of the box, and start to remove the packing.
The customer taped a 1 x 10 board to the surface to protect it.
I cut the tape to remove the board and the first thing I see is oil and sand.


More sand on the bottom of the head.


Head must be fully disassembled and cleaned.

Getting the towel from around the head, I find a cam gear was busted in shipping.


Looking at the bottom of the head, notice the valve placement.

Also Notice the head was belt surfaced.




The Intake valves are in the exhaust seats, and the Exhaust valves sunk into the Intake seats.
Customer supplied pic
 

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DIY Guru
96 Ranger-stock
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637 Posts
Discussion Starter #2
Putting the proper valve in the proper seat should fix the issues with this head.

Next is to pull the cams… So remove the cam caps, I notice that the caps have been swapped sides and backwards.
Intake side is to the bottom of pic, front is to the left


I mark the head casting, the cams, and the caps with a letter to ensure the same caps end up back on the same casting.


With the caps, cams, followers and HLAs removed, I check the cam bores

Notice the grey black oil, this is from the cam trying to self-clearance.


Next remove the oil galley plugs.

I find grit and rust on the backside of the plug


Rubbing oil from the galley between my thumb and finger I feel grit, I cannot see it tho.
 

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DIY Guru
96 Ranger-stock
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637 Posts
Discussion Starter #3
I did this several times to make sure it was not grit on my fingers I was feeling.

Next I remove the springs and retainers.
Stock retainers and locks.
Aftermarket Manley Valve Springs.


There was no need to check valve tip height, due to the valves being in the wrong seats.

I measure the head for thickness

Exh Rear 5.194 Int Rear 5.193

Exh Front 5.190 Int Front 5.200

New head spec 5.205 Min 5.185

Roll the head over and inspect the seats.

All the exhaust seats were ground, appox seat width is .095


I also noticed hard carbon build up between the guide and head casting.


On the intake side Cylinder numbers 1, 2, and 3
The seats were appox ground halfway around.
With Intake side facing, the ground area runs from appox 9 to 12 to 3.





The seats were fully ground on cyl #4 Intake

Intake seats were appox .095-.125

IMO, the seat widths are to wide, and should be .030 on the intake and .040-.050 Exhaust.

I decided to check valve seat run out




On cyl #4 intake seats, I found .004 and .006 on the other.


I will fully go thu the head, clean, Valve job, surface and oil port mod 1, New valve stem seals will be installed, and spring installed height will be checked, and shims will be used as needed.
 

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1,987 Posts
love these posts from your machine shop, very informative
 

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DIY Guru
96 Ranger-stock
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637 Posts
Discussion Starter #7
Here is the sad part, this was done by a shop that specializes in this engine.

This guy pulled it out the box and bolted it down. It never fired, It took 2 or 3 weeks of tech reppin on a forum. then he finally pulls the head and sent it to me.
 

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same
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1,881 Posts
Hopefully they can yet their money back on the repairs from this shop that royally fucked this head. About the worst I've ever seen on a so called finished head.
 

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DIY Guru
96 Ranger-stock
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637 Posts
Discussion Starter #9
Hoove... If I said the name of the shop, and you ran it thu Google. You would not be surprised.

Yes he did get a full refund, along with a new MLS HG and oil.

This has not been my only or first and doubt my last time fixing there junk.

Ill post a short block build they did later for you.
 

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Sloppy Jalopy
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981 Posts
How is it possible to mix up the valves like that...?

Ahh the blind folded one hand behind the back head assembling Trick,,
 

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Well.......
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2,488 Posts
Here is the sad part, this was done by a shop that specializes in this engine.

This guy pulled it out the box and bolted it down. It never fired, It took 2 or 3 weeks of tech reppin on a forum. then he finally pulls the head and sent it to me.
Name of the shop?

Or if you dont want to put them on blast, pm me it I am good at keeping my mouth shut.
 

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Never finishes (TWSS)
91 Civic SI hb
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1,871 Posts
i cant believe a shop could mess that many things up, how were the guides, within spec lol? that shop, in theroy made the head worse then when it came in. no matter what was wrong with it. ill bet it had the valves in the correct holes when it entered their shop. also you should get the guy whose head this is to post about it somewhere online. you dont what that happening to others
 

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DIY Guru
96 Ranger-stock
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637 Posts
Discussion Starter #15
Good try Sailor but your guess is incorrect. Thank you for playing
 

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DIY Guru
96 Ranger-stock
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637 Posts
Discussion Starter #17
I doubt the sand was on the outside of the head like that, most of the big chunky sand would have come from the water jacket of the casting
 

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I enjoy reading up what you put down.

If you are using an iPhone for the pix you don't need to press the white imaginary button on the bottom, you can press one of the volume buttons on the side. It makes it easier sometimes than trying to strech your thumb down to hit the button. It could cut down on the blurryness.

If you are using something else just ignore me. Haha
 

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DIY Guru
96 Ranger-stock
Joined
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637 Posts
Discussion Starter #20
How much does rebuilding a head like this cost?
Since I am not a supporting vendor I would advise you to check with them.

Price ranges can vary depending on what part of the country you are in along with what equipment is used and the experience of the machinist.
 
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