Ok. Developed what I call loud tapping, knocking, skipping sputtering....cylinder #1 , 130# compression, #2, 130#, #3, 30#, #4, 30#. Engine was rebuilt at 288,000. Now has 299,000. 1984,22R xtra cab, SR5. SUGGESTIONS.............., Thanks.

PS. Valves seem ok.

 

Blown head gasket between #3 and #4????

Perform leak-down test.

 

How do you know the valves are ok? Did you take the head off?
Another way to check is to leave plug # 3 in and check #4 then put #4 plug in and check #3. See if the compression changes
Hump

 

Hey all.......figured a head gasket. The plug deal. Thought of that but just haven't got to it yet. Today I will........

 

OK.............now confused..........I did the plug swap......#3 out with #4 in..........still about 30# maybe a little less.........#4 out and #3 in............same result..about 30# or a little less. I figured that I would b\get some increase due to having the open plug hole blocked......but no. Now ....what you guys think. ???

PS......I rechecked #2. and only got 120#.......so a little less since the engine is completely cold now. So the little less on #3 and #4 is in line with a little less pressure overall.

 

Well, whatever the issue, I have started the Tear down. If this doesn’t work our, anybody interested in a used truck?

 

You never told us what truck it is.
Pics
If the compression didn't go up with the plug swapping then it could be 2 bad valves, did you check the rockers to see if they were moving the valves up and down?
Hump

 

Ok, the rockers are all moving and the valves seem to be opening/closing right. The plug swap did confuse somewhat. Oh...1984 SR5 Xtra cab.

 

Wow, Nice looking truck
Anytime you want to call it quits just let me know and I'll send a tow truck there to pick it up
I could always get another brother for my 84..............
Hump
Mike

 

Well, haven’t been pushing the repair so just getting into it. There sure are a lot of vacuum lines on this thing. Making pics as I go to see if I can put her back together properly.

 

I'm soooo glad I live in a state that doesn't require smog tests...............Desomoged mine and I can almost guarantee you that that smog equipment on your truck hasn't worked in years.......
Good luck
My offer still stands, sell it to me and move on
Hump

 

Can't wrap my head around this put this plug in and this plug out mojo..

Put compressed air into the cylinder, leak down test, if it's blowing out another sparkplug hole it's bad juju..

 

Hey Hump.......I would love to not have to put all those tubes back on. Can you show me just what I need as basic?? By the way, the wife says that the truck needs to go out west!!!

 

Well, got down to it. Between 3 & 4....Surprising how such a small gap creates such havoc! Now, to get a gasket set and reassemble.

 

Guess I should have put up a pic of the gasket itself!

 

Was that a Toyota head gasket?

 

The emissions systems on these engines really aren't as scary as they look.

While there are many vacuum lines, I found that looking at each emissions system separately in the Factory Repair Manual makes things easier to understand, plus you can see where each vacuum hose goes.

For the record, all of my original emissions equipment is still functioning properly.

 

The engine was rebuilt at 288,000 miles. I do not know if it was another original gasket reinstalled. Seems to me that there were holes stopped up that should have been left open. ???? There re right at 300,000 miles now. ;

 

Dayley
Listen to your wife
Hump

 

Howdy yotatech brother. If you have or can put your hands on a good straightedge, (I use a machined piece of steel bar I scrounged a couple of years ago), you might want to start checking that the block is not warped or cupped. It happens a lot and the low spot is usually in the center between the cylinders, right where your gasket failed. If the block is flat, the problem might be that the head is warped. If everything is flat, maybe the head bolt holes weren't cleaned out properly and the bolt torque was too low. Head gaskets should last longer than 12,000 miles though. There is a reason that thing failed so fast.