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.

Latest job alerts …
Muncie, IN, United States
Upcoming industry events …
November 4-6, 2025 - Jaarbeurs, Netherlands
November 14, 2025 - Melbourne, Australia
December 10-11, 2025 - Louisville, United States
Movers & Shakers
Kai von Berg Kai von Berg
VP sales Europe, EP Equipment Europe
Group president - Vancouver operations, Columbia Machine
Business development manager - UK, IRE, BENELUX, Tyri Lights
President and CEO, Wajax Corporation
Toplift Ferrari TFC36-48
Stoney Creek, Ontario, Canada
Used - Sale
USD1
Terberg RT403
Balling, Denmark
Used - Sale
Global Industry News
edition #1254 - 30 October 2025
In this week’s Forkliftaction News - As an industry, our focus is often on key economic indicators such as productivity and profitability, but we all know our sector simply wouldn’t exist without the skilled operators who bring the machinery to life... Continue reading
Editorial calendar - planned features
CONSTRUCTION FORKLIFTS
HANDLING GOODS IN THE COLD
LOADING/UNLOADING FREIGHT
BROWNFIELD AUTOMATION
FORKLIFT ATTACHMENTS
BATTERY AFFORDABILITY AND LIFETIME
FORKLIFT SAFETY