Pulled a 1987 out of a hole

[captain720]

My engine at its own headgasket for lunch.

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[captain720]

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[captain720]

As far as I can tell the valve seat looks to have been I damaged by the headgasket it ate, I may lap it just for the sake of doing it.

 

[IDIBRONCO]

Is this a problem where the gasket got sucked into the valve?

It's hard to tell. After you lap the valve, make sure that the valve is sealing. Install the valve, turn the head so that port is facing up, and then fill the port with something like diesel or gasoline. Then if it's not sealing, you will be able to see the wet area left by the leak.

What about this little piston scuff?

It looks kind of close to the cylinder wall. Is it small/thin enough that you can slide something beside it and remove a burr?

 

[captain720]

That is a good thought thanks @IDIBRONCO
I am pretty sure the piston scuff clearanced it self already but I may be able to file it a tiny bit.

 

[Nero]

I see three things I don't like. Hone marks are starting to wipe off. Head gasket eaten by a valve. Then there's the piston.

So here's what I'd suggest before lapping valves. How we test for leaking valves at work is to pour fresh diesel into the intake and exhaust ports, then check for weeping diesel past the valve seat.

Or just lap it and send it lol

 

[captain720]

The diesel test is a good idea, I will likely clean it up and do that test. I am not worried about the slightly faded cross hatch, in all my years of driving old junk I’ve never even had a cross hatch this good.

 

[hacked89]

Besides the diesel test don’t forget the roll the valve stem and pushrods on the ground to check for straightness. Those three quick things then send it.

 

[IDIBRONCO]

I am not worried about the slightly faded cross hatch, in all my years of driving old junk I’ve never even had a cross hatch this good.

Plus I'm sure that you're not looking to do an overhaul right now. That's why I didn't suggest pulling the piston out to clean that mark off.

 

[captain720]

Plus I'm sure that you're not looking to do an overhaul right now. That's why I didn't suggest pulling the piston out to clean that mark off.

Yes that is correct, I wouldn’t be opposed to overhaul and especially on what appears to be an excellent candidate but I don’t think it’s due yet and with the transmission in the psd at the same time I’m already pushing it on funds.

 

[The_Josh_Bear]

Besides the diesel test don’t forget the roll the valve stem and pushrods on the ground to check for straightness. Those three quick things then send it.

Haha I dunno what kind of ground you have... I'd roll them on a nice clean flat surface. But that's a stellar tip to keep in my noggin.

 

[captain720]

Haha I dunno what kind of ground you have... I'd roll them on a nice clean flat surface. But that's a stellar tip to keep in my noggin.

I could get all ridiculous and spin them in the lathe and measure them with a dial indicator, but we all know I’m not about to do that.

 

[hacked89]

You’d be surprised the method I mentioned on a flat surface your eye can catch things slightly off pretty easily

 

[hacked89]

If you want to get a bit fancier to top things off the 3 stage aerosolized dye test can show you cracks and is relatively inexpensive

 

[Black dawg]

The diesel test is a good idea, I will likely clean it up and do that test. I am not worried about the slightly faded cross hatch, in all my years of driving old junk I’ve never even had a cross hatch this good.

The crosshatch is a non issue.

Anything out of the ordinary with the headbolts surrounding those cylinders?