Need advice from the forum with regards to replacing the Head Gasket as PM:
- 197,000 miles, no HG job that I am aware of
- Bubbler test comes back clean after 15min
- Blackstone shows medium levels of coolant in oil (not high, not trace either)
- White smoke on startup then it goes away
- No oil leaks
- 1qt of 5w30 burned per 3,000 miles
Should I or should I not replace the HG?
I finally got a chance to get on and review and reply to your post.
I'll start with mine: My PO had the HG done at 145K and fortunately had the head rebuilt at the same time. I now have 232K on it and I don't lose any oil between oil changes at 7500 miles. I am VERY fortunate for this part of my truck, considering all the other stuff I had to do.
The cost of replacing the head gasket and having the head rebuilt will be in the $4K range, to do it correctly. The head need to be crack checked, have the seats ground, valves ground, new valve guides (if needed), new valve seals and have all the springs checked for travel and correct seat pressure. Of course, this should also include checking the head for warp, and if it is warped, having it planed and having the block checked for true and decked if necessary.
I am one that really goes for good maintenance on all my vehicles so I stay in front of problems. My first reaction is to say that no, I wouldn;t do it as PM. However, as I sit here typing, I know I'm lying to myself, because if I have a Blackstone analysis that is telling me I have coolant in my oil and I'm losing oil at a quart per 3000 miles, that thee engine is not as reliable as I would like it to be. I personally have had what appeared to be head gaskets go on 2 different engines in my lifetime and each time when they went, it was catastrophic. One was actually a cracked head, and one was an incorrect machine job on the heads of a fresh V8. Since a head gasket is just a matter of time before it goes completely, I will not sleep well or drive it confidently as a daily driver or take it on that trip I want to go on until it's been done. However, when I do it, I will usually go the extra mile because I feel it is only a bit further to do the job "right" while I have that part to do. Basically, I would end up completely rebuilding the engine. That's what would give me the confidence in it. Rebuilding the entire LC engine will be closer to $8K if I was to guess. Reading on this forum, it may be north of that even unless you do a fair amount of work on your own.
Another possibility would be to dedicate myself to the gathering of parts to do a swap while the truck is still alive and amass all those things that I would need BEFORE it goes. I would probably even rebuild the engine I am planning on swapping in, just so I wouldn't have to do it again later. Unfortunately, I am a chronic complicator that way........
My PO had my HG done by Olathe Toyota as near as I can tell. I'm not sure who decided it no longer needed the idler pulley for the belt or the adjuster bracket for the alternator or the spark plug wire covers on the top of the head, and to install the air tube from the filter to the throttle body backwards.
Yank the engine and transmission (they say it's easier that way), and take it to an engine rebuilder that KNOWS Toyota Land Cruisers and have it rebuilt top to bottom.
Of course, the LS1 would make the truck a much more comfortable truck on the highway and would most likely improve gas mileage and HP, since I know you are not a rock crawler. Of course, you can always go LS6 or LS7 to get the massive torque and HP, but your gas mileage will suffer and you'll have to install heavier springs in the front but it sure would be tire-smoking fun!
The LS1 would be a good fit for a DD but can you justify the change? How much does a quart of oil cost per oil change? Not financially feasible, but then owning a 20 year old truck isn't all that feasible either........