I had another thread going for my 1PZ leaking injection pump which I had rebuilt, and had updated it about how the mechanic I had used to re-install the IP could not get the timing right, and I ultimately had to take it elsewhere. Link to that thread below...
Well, this headache has continued and turned into a whole other animal. I was referred to a local diesel mechanic who is Venezuelan and used to work at a Toyota dealership in VZ before coming to the US and is very familiar with Toyota diesels. He has multiple other 70's in his shop that he's imported. I have no idea how I had never heard of this guy - seems like his primary business is heavy equipment repair but he's a cruiser enthusiast on the side. Anyway, I was lucky to find somebody local who knows their s*** and could pick up where the last shop failed.
Once he got the truck, he checked the injection timing but suspected something else might be wrong upon trying to crank the truck. Timing of everything was right but the truck was fighting to crank. We did a compression test and all 5 cylinders were low. The best was 137 psi, the lowest was only 63 psi...minimum per the service manual is 384 psi...
Long story short, we've since disassembled the engine and found worn or broken piston rings on all 5 cylinders. Additionally, the intake was coated with black oily material. It's our suspicion that the previous mechanic may have been spraying something into the intake (ether?) to try and help the truck crank. Some combination of this material and unburnt diesel likely built up in the pistons from the excessive cranking without firing, and essentially hydro-locked, pushing the liquids past the piston rings and into the oil pan. Further evidence of this was very non-viscous oil once we took the oil pan down, which is probably because the oil had been diluted by a bunch of diesel.
Intake full of black oily crap. I could easily see how this would be abrasive to the piston rings.
Valves. No apparent issues.
Cylinders. The bores are smooth and clean. Look really good with the exception of some heat discoloration on the back two cylinders.
1PZ Leaky Injection Pump
Went into the garage the other day after I had driven the truck around town a bit and thought it smelled like diesel. A quick look under the truck revealed some fluid was dripping on the front axle housing. Further investigation under the hood and it seems to be diesel dripping from the...
forum.ih8mud.com
Well, this headache has continued and turned into a whole other animal. I was referred to a local diesel mechanic who is Venezuelan and used to work at a Toyota dealership in VZ before coming to the US and is very familiar with Toyota diesels. He has multiple other 70's in his shop that he's imported. I have no idea how I had never heard of this guy - seems like his primary business is heavy equipment repair but he's a cruiser enthusiast on the side. Anyway, I was lucky to find somebody local who knows their s*** and could pick up where the last shop failed.
Once he got the truck, he checked the injection timing but suspected something else might be wrong upon trying to crank the truck. Timing of everything was right but the truck was fighting to crank. We did a compression test and all 5 cylinders were low. The best was 137 psi, the lowest was only 63 psi...minimum per the service manual is 384 psi...
Long story short, we've since disassembled the engine and found worn or broken piston rings on all 5 cylinders. Additionally, the intake was coated with black oily material. It's our suspicion that the previous mechanic may have been spraying something into the intake (ether?) to try and help the truck crank. Some combination of this material and unburnt diesel likely built up in the pistons from the excessive cranking without firing, and essentially hydro-locked, pushing the liquids past the piston rings and into the oil pan. Further evidence of this was very non-viscous oil once we took the oil pan down, which is probably because the oil had been diluted by a bunch of diesel.
Intake full of black oily crap. I could easily see how this would be abrasive to the piston rings.
Valves. No apparent issues.
Cylinders. The bores are smooth and clean. Look really good with the exception of some heat discoloration on the back two cylinders.