Helping a friend on a motor problem in his jeep, while we are having good weather! We knew he had lost a head gasket, so today was exploratory surgery.
We started with this:
Everything must be labeled, so it can go back right.
This is the secret of repair work, anyone can do significant repair work; if everything is labeled as it comes apart!
It also helps to put the screws back in place by hand as you go. That way, when you reassemble them, you have the right screws, in the right place....
After we played for about 4 hours we had this:
And yes, the green in the back cylinder is antifreeze, it drained out of the head when we tilted it up for removal. The second cylinder is rust in water from the failed head gasket, which we expected from the dry / wet pressure testing.
The head doesn't show obvious cracks:
But it did show valve damage caused by towing above rated Loads! This was unexpected, and may have destroyed the valve seats in this head....
They look like this:
And this:
You can see a burn on both valves, with one burned on opposite sides. This is caused by heavy loads and rich mixtures raising the EGT (exhaust gas temperature) beyond safety limits. The aircraft actually have an EGT guage specifically to allow the pilot to avoid damage by this same scenario, by leaning out the mixture in flight. We'll need to remove the damaged valves to inspect the valve seats, to decide if this is a usable head, or scrap!
The other unexpected problem is here:
The intake manifold lost an ear just like Van Gogh! This one is easier to fix with a heli-arc welder, which will allow this manifold to be as good as new soon.
The outcome is dependent on the condition of the valve seats. If they are also repairable, he may decide to repair this motor; if not, it will need to be replaced. He is leaning to putting in a V-6 so he can tow without burning valves.
I'll let you know what he decides to do, and show the final repair! Hope you enjoyed the look inside this engine.🚂
💗🤠💙👍
Be blessed!
What? You don't just guess? 🤪
Quicker not to guess, so nope. I could probably manage without, but why bother?
Besides, I hate working on cars, LOL!
💗🤠💙😆😁🤕🥳👍
Guessing can be problematic for sure. 🤔😁
All you need do is get the firing order wrong....
I'm just to the insurance and tag point on my truck; finally, I need the beast working now! Lots of homesteading to do.
💗🤠💙😁👍🤕🥳
Haha, yeah the firing order tends to be a rather important thing to get right. Seems like you've been making some progress.
I'm hoping it won't get ugly, and we have to shoehorn in a V6 to replace this straight 4! That would mean making a lot of custom connection piping, and I'd need to get out the oxy-acet welder.
I don't like a fix like that, but that's up to him to decide.
💗🤠💙👍🤕🚂😆
I used to own a power saw. I would service it weekly myself after being shown around by a friend.
It's good to have a local friend! Some jobs work better with two sets of hands. Power equipment is a great time saver, as long as you keep them running!
Be blessed my brother
💗🤠💙🙏👍✝️🚗🤕
Wow those valves have had a hard life.
Yes, when the head leaks, the cylinders affected can ingest a little water. Water in an internal combustion engine, will burn, and significantly increase power...and temperature. They used to do this deliberately in WWII in fighter planes, they called it war emergency power! When used, they were supposed to pull the engine apart to check for damage. I'm not sure what he plans to do yet, but I'm still hoping for a simple head repair.
💗🤠💙🤕👍😁🚂