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DIY Guru
96 Ranger-stock
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637 Posts
Discussion Starter #1
Dropped Valve Head Repair


The Subject head is a 1G 6 bolt head.
This head had extensive work done to it and would cost way more to replace than repair.

The head was loaded with SuperTech +1mm valves, and duel valve springs and Ti retainers.

How the head looked when I received it.



A closer look at #4 cylinder, the one that dropped the valve.



Yes it looks pretty beat. But it is fixable.

First thing to do is disassemble the head and get a parts list going.
At first look, I thought the 4 valves in the #4 cylinder would be the only ones needing replaced.
It turned out only 4 valves of the 16 could be used.


The SuperTech duel springs and Ti retainers tested fine and will be used. About half of the Ti retainers had be rubbed on.

At this time it was decided to install bronze guides, to replace the stock appearing cast iron guides.


The bronze guides installed.


Once the head was cleaned, a couple small cracks were found in #1 cylinder.
 

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DIY Guru
96 Ranger-stock
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637 Posts
Discussion Starter #2
The seats were cut out


Then the head was pressure tested, using 35psi in the water jacket.
The head did not leak.
So work progressed by removing the 4 seats in #4 cylinder.



New counter bores were cut, and oversized inserts were installed.


Some grinding, polishing and blending was done to smooth out some of the damaged area in the combustion chamber.

Next was to mark the spots to be welded.

What it looked like once back from the welder.


Also to note is the spark plug inserts were installed in cylinders #1 and #4 before welding.

From this point a bit more blending was done to smooth out the welds and a full valve job was performed.

As the seats were cut,


Valve tip height was checked and set to the proper specs.
 

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DIY Guru
96 Ranger-stock
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637 Posts
Discussion Starter #3
Spring installed height was measured and set to 1.550 @ 85lbs


New 3g HLAs were installed, along with the followers and cams.


Bottom of the head.


Close up of #4 cylinder after repair.


Head thickness after repair and rebuild. 5.159
Head build # BBB 744
 

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DIY Guru
96 Ranger-stock
Joined
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637 Posts
Discussion Starter #6
how much did all of that cost the end user?
I honestly do not remember, I did that head a couple years ago, I want to say around $600..A replacement head from the company that first did it would have been around $2000
 

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Tape-R taper/driver
EC3, ED8, ED9, EE5
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574 Posts
I honestly do not remember, I did that head a couple years ago, I want to say around $600..A replacement head from the company that first did it would have been around $2000
That was going to be my question, but a $1400 difference is enough to warrant salvaging.

So, I recently paid $300 for a bore (.020), hone, deck (.010), mill (.010), and lapping on a 16v head/valves.

You did all of those repairs above for just twice that. Which one was too cheap? lol
 

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DIY Guru
96 Ranger-stock
Joined
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637 Posts
Discussion Starter #8
Low, This is kind of my mantra... Not all shops are equipped the same, and pricing varies across the country.

But for what you had done, I would have been in the ball park, but a few dollars higher. I do not just lap valves, I would have cut the valve seats.
 

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Tape-R taper/driver
EC3, ED8, ED9, EE5
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574 Posts
Now that you mention it, I think I used the wrong term. I'm pretty sure they cut the valve seats and valves.
 

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DIY Guru
96 Ranger-stock
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637 Posts
Discussion Starter #10
fair enough then. Or they may have been ground. there are a few different ways a valve job can be done.
 

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Registered
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Spring installed height was measured and set to 1.550 @ 85lbs


New 3g HLAs were installed, along with the followers and cams.


Bottom of the head.


Close up of #4 cylinder after repair.


Head thickness after repair and rebuild. 5.159
Head build # BBB 744
Dat quench! Awesome write up
 

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the artist formerly known as drexelstudent11
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3,983 Posts
I honestly do not remember, I did that head a couple years ago, I want to say around $600..A replacement head from the company that first did it would have been around $2000
ouch, good to know if my s2k ever drops a valve
 

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DIY Guru
96 Ranger-stock
Joined
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637 Posts
Discussion Starter #14
Shoebox.. I have done one of those before.. Was a fun head to build, Did the Mod Valve job on it and some runner port work. The Guy came back a few weeks later and was all grinz and he smoked the tires down the street.
 
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