Hello team,
This is my first time posting here on the forum, although I have been reading them for over 3 years now.
I have some issues which I am trying to figure out for sometime now and I don't know the exact culprit, partly because I am quite illiterate when it comes to vehicles.
BTW I am writing this from Pakistan and we don't have good workshops here. The guys here at workshop mostly do experimentation.
The problem goes like this, I have HZJ81 which is 1992 model. The last owner swapped the engine to 1HDT so technically its HDJ81 now. When I bought this truck it was in terrible condition mechanically but looked really nice from outside. Anyways I bought that cos I was new to cars so couldn't check thoroughly.
Shortly after that I left my country for work assignment and I gave the truck to my father to drive. One day it stopped in the middle of road creating huge clouds of white smoke. The folks here at my home took the truck to a workshop and they suggested engine rebuilt. So the guys did whole rebuilt of the engine and drive train and changed the bushings underneath the body.
This all happened 2.5 years ago and the truck is being driven locally after that.
Now that I am back I have started using that as my DD and take it to long drives also.
Following are the issues I am facing,
- There is very less torque. I could climb steep roads in first gear only and very slow and seems like the engine/car is struggling heavily.
- On the other hand I get good fuel average 9 km/lit locally and 11 km/lit on highways.
- Last weekend I decided to go step by step and went for the compression test. All the pistons came around 650 psi on the compression test. (the pistons are +0.5 mm). Isnt 650 psi a bit on higher side?
- The biggest problem after the torque I am facing is the speed on highways. I checked with GPS that I am at 95 kmph at 3100 rpm in 5th gear. Now this rpm number is too high considering I am on a diesel engine. I assume I am running H151F transmission behind the engine. Its a manual btw. Even at 1st,2nd,3rd and 4th gear I am not even fast enough and RPM reaches 3000.
- The car doesn't cross 3000 RPMs easily, I can go max to 3100 rpm and its already too noisy and the car struggles after that.
- I am running 4.1 diffs, I checked them manually by putting car on jacks and rotating tyres and observing shaft.
- My turbo is at 7 psi at 3100 rpm. I never saw a figure above 7 psi.
- Do you guys think its problem with Clutch kit (RPM vs speed thing)
- Do you think that the gears in my gear box are messed up?
- Do you think its the issue with the transfer case (related to speed vs rpm)?
- Do you think its problem with Pump, Nozzles and Tappet settings?
- Can you please suggest what should I do next? Regarding both speed and torque issues.
- It seems my engine is in good health (referring to compression test) but something else is creating issue.
I am waiting for suggestions, meanwhile I will add here any description that I will remember more.
Cheers, Bilal
This is my first time posting here on the forum, although I have been reading them for over 3 years now.
I have some issues which I am trying to figure out for sometime now and I don't know the exact culprit, partly because I am quite illiterate when it comes to vehicles.
BTW I am writing this from Pakistan and we don't have good workshops here. The guys here at workshop mostly do experimentation.
The problem goes like this, I have HZJ81 which is 1992 model. The last owner swapped the engine to 1HDT so technically its HDJ81 now. When I bought this truck it was in terrible condition mechanically but looked really nice from outside. Anyways I bought that cos I was new to cars so couldn't check thoroughly.
Shortly after that I left my country for work assignment and I gave the truck to my father to drive. One day it stopped in the middle of road creating huge clouds of white smoke. The folks here at my home took the truck to a workshop and they suggested engine rebuilt. So the guys did whole rebuilt of the engine and drive train and changed the bushings underneath the body.
This all happened 2.5 years ago and the truck is being driven locally after that.
Now that I am back I have started using that as my DD and take it to long drives also.
Following are the issues I am facing,
- There is very less torque. I could climb steep roads in first gear only and very slow and seems like the engine/car is struggling heavily.
- On the other hand I get good fuel average 9 km/lit locally and 11 km/lit on highways.
- Last weekend I decided to go step by step and went for the compression test. All the pistons came around 650 psi on the compression test. (the pistons are +0.5 mm). Isnt 650 psi a bit on higher side?
- The biggest problem after the torque I am facing is the speed on highways. I checked with GPS that I am at 95 kmph at 3100 rpm in 5th gear. Now this rpm number is too high considering I am on a diesel engine. I assume I am running H151F transmission behind the engine. Its a manual btw. Even at 1st,2nd,3rd and 4th gear I am not even fast enough and RPM reaches 3000.
- The car doesn't cross 3000 RPMs easily, I can go max to 3100 rpm and its already too noisy and the car struggles after that.
- I am running 4.1 diffs, I checked them manually by putting car on jacks and rotating tyres and observing shaft.
- My turbo is at 7 psi at 3100 rpm. I never saw a figure above 7 psi.
- Do you guys think its problem with Clutch kit (RPM vs speed thing)
- Do you think that the gears in my gear box are messed up?
- Do you think its the issue with the transfer case (related to speed vs rpm)?
- Do you think its problem with Pump, Nozzles and Tappet settings?
- Can you please suggest what should I do next? Regarding both speed and torque issues.
- It seems my engine is in good health (referring to compression test) but something else is creating issue.
I am waiting for suggestions, meanwhile I will add here any description that I will remember more.
Cheers, Bilal