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.

Global Industry News
edition #1260 - 11 December 2025
In this week’s Forkliftaction News we report on DHL Supply Chain signing a deal to deploy autonomous mobile robots (AMRs) at its Mexican retail operations and look at Guidance Automation’s successful trial of an AMR with a hydrogen fuel cell... Continue reading
Upcoming industry events …
January 28-30, 2026 - Bangkok, Thailand
March 4-5, 2026 - Detroit, Michigan, United States
March 24-26, 2026 - Stuttgart, Germany
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
Taylor TXB180S
Coraopolis, Pennsylvania, United States
Used - Sale & Hire
Ncn 85TH
Ncn 85TH 2014
Balling, Denmark
Used - Sale

Showcased in the Virtual Expo

Global Industry News
edition #1260 - 11 December 2025
In this week’s Forkliftaction News we report on DHL Supply Chain signing a deal to deploy autonomous mobile robots (AMRs) at its Mexican retail operations and look at Guidance Automation’s successful trial of an AMR with a hydrogen fuel cell... Continue reading
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