Discussion:
Komatsu 4d95s engine running trouble

Hello everyone first of all I'm new to the forum. I'm a forklift dealer in th UK.

I have a FD 25 with an 4D95s motor. It's recently had reconditioned injectors, new rings and honed bores. With the new head gasket fitted, skimmed head and valves adjusted I started it up to find it ran poorly and struggled to rev up. I cracked the injectors and found that cracking no.1 made no difference to the engines running which suggested the problem being on that cylinder. When number 2, e and 4 were cracked the engine cut out. I compression tested 1 and 2 which had pretty much the same reading. I swapped 1 and 2 injectors around and the same problem.

Any suggestions? Also the fuel stop solenoid doesn't work and is stopped manually by cable.

Thank you.
  • Posted 20 Oct 2015 07:33
  • By kelvin_h
  • joined 20 Oct'15 - 1 message
  • Beds, United Kingdom

Post your Reply

Forkliftaction accepts no responsibility for forum content and requires forum participants to adhere to our rules of conduct. Click here for more information.

If you are having trouble using the Discussion Forums, please contact us for help.

PREMIUM business

Linde Material Handling
Linde Material Handling is your full-service provider. From forklifts to automation - we stand for innovation and for your performance.
Movers & Shakers
Jett Chitanand Jett Chitanand
President EPG Americas, Ehrhardt Partner Group (EPG)
CEO, Duravant
Manager of automated solutions engineering and implementation, MHS Lift
President and CEO, Manitou Group
Upcoming industry events …
January 28-30, 2026 - Bangkok, Thailand
March 4-5, 2026 - Detroit, Michigan, United States
March 24-26, 2026 - Stuttgart, Germany
Fact of the week
Foundling hatches are safe, anonymous drop-off points for unwanted infants, allowing parents in crisis a way to surrender a baby safely without fear of punishment, ensuring the child is rescued and cared for. The concept started in the 12th century, was abandoned in the late 19th century, then reintroduced in 1952. It has since been adopted in many countries.

Showcased in the Virtual Expo

Movers & Shakers
Jett Chitanand Jett Chitanand
President EPG Americas, Ehrhardt Partner Group (EPG)
CEO, Duravant
Manager of automated solutions engineering and implementation, MHS Lift
President and CEO, Manitou Group