Best and worst Cummins ISL 400 engine years - iRV2
Sep 5, 2022 · I’m looking to buy an ISL 8.8 or 8.9 engine with the common rail fuel system and without the DEF system. What are the best and worst years to buy? Also, any...
Cummins ISL9 engines....Good, Bad or Ugly? - iRV2
Jun 22, 2025 · The **Cummins ISL 425 HP** (often the ISL9 or ISL 8.9L, depending on year) is generally a **strong, reliable engine**, but like any heavy-duty diesel, it has some known issues …
Cummins ISC fuel backflow when engine stops | iRV2 Forums
Oct 5, 2012 · When an ISC stops running, should the high pressure fuel flow back through the filters toward the tank? Is this normal to relieve pressure and extend filter life, or does it indicate a failed …
Transfer Case Seal Failure - 2024 RAM 2500 6.7 L Cummins Diesel
Jan 27, 2025 · Hello fellow RAM owners. Steelbob611 / Texas here. I am new to this forum and a first time RAM truck owner after a lifetime of being a GM truck and SUV owner. Made the switch and …
Cummins 8.3 Engine Evolution - iRV2
Sep 24, 2015 · Many of these are equipped with Cummins 8.3/ISC engines coupled to a 6-speed Allison which looks to be a great combo. I also am partial to Cummins engines after my experiences with the …
Cummins 8.3 ISC valve train problems - iRV2
Aug 29, 2022 · I have a 2001 Monaco with the 8.3 ISC 350. It developed a rattle sound at above idle RPM. Took it to Cummins NW in Portland Oregon. They said #2 hole is dead. They checked the …
Best oil and filter for new 2022 6.7 Cummins? - RAM FORUM
May 11, 2022 · Fleetguard is Cummins filter brand. Cummins also recommends Valvoline Super Blue full synthetic oil but you can't go wrong with any of the big name diesel oils: Mobil Delvac, Rotella T6, …
Cummins ISL9 450 - 13k miles with 2 major engine failures
Nov 12, 2021 · The Cummins-certified shop repaired the engine under warranty which included replacing the fuel injector, two pistons and sleeves, some turbocharger parts, and a new …
Cummins ISL 400 Engine Failure - iRV2
Jul 8, 2017 · Not to bring up an old problem with Cummins ISL 400 engines, but I didn't know it was an old problem until we recently (June 2017) experienced catastrophic engine failure and started …
Cummins ISC 8.3 L not starting- Lift Pump issue? - iRV2
Apr 27, 2020 · Hello All. I have a 1999 Fleetwood American Eagle with a Cummins ISC 8.3 L motor that is very difficult to start lately. The problem has now worsened to...