MicksMack Posted January 3 Share Posted January 3 Hey guys, Have been told that the E9 V8 will lock up once the engine is worn . My question is what is the root cause? Lack of oil pressure due to bearing wear? Excessive float between the big end of the conrods creating lateral friction? The engine in my truck runs well and has good oil pressure but how do I check that it is actually a healthy engine and not worn to the point of potential failure. Ive just bought the truck and the mechanical history is not well tracked. Thanks fellas Quote Link to comment https://www.bigmacktrucks.com/topic/76285-e9-nipping-up/ Share on other sites More sharing options...
fjh Posted January 4 Share Posted January 4 17 hours ago, MicksMack said: Hey guys, Have been told that the E9 V8 will lock up once the engine is worn . My question is what is the root cause? Lack of oil pressure due to bearing wear? Excessive float between the big end of the conrods creating lateral friction? The engine in my truck runs well and has good oil pressure but how do I check that it is actually a healthy engine and not worn to the point of potential failure. Ive just bought the truck and the mechanical history is not well tracked. Thanks fellas Oil sample! Never seen what you’re talking about ! Sounds as though you’ve been illenformed ! I have seen v8 drive into the shop with a Broken crank shaft they rarely seize! How many hours? Quote Link to comment https://www.bigmacktrucks.com/topic/76285-e9-nipping-up/#findComment-588340 Share on other sites More sharing options...
Joey Mack Posted January 4 Share Posted January 4 Is this a marine engine that ingested sea water? E-9's just run... Quote Link to comment https://www.bigmacktrucks.com/topic/76285-e9-nipping-up/#findComment-588343 Share on other sites More sharing options...
Full Floater Posted Friday at 05:54 PM Share Posted Friday at 05:54 PM Seen an 855 Cummins do this after its 4th overhaul. Curious if it's been overhauled recently and the wrong rings or pistons installed. Quote Link to comment https://www.bigmacktrucks.com/topic/76285-e9-nipping-up/#findComment-588758 Share on other sites More sharing options...
R.E.D Posted 6 hours ago Share Posted 6 hours ago On 1/9/2026 at 11:54 AM, Full Floater said: Seen an 855 Cummins do this after its 4th overhaul. Curious if it's been overhauled recently and the wrong rings or pistons installed. That's probably due to fretting which is common on the whole 855 family, specially upwards of 500hp..after so many overhauls , probably an out of frame , resurfacing the block and main caps and then a line bore to bring it back to true woulda been needed . Quote Link to comment https://www.bigmacktrucks.com/topic/76285-e9-nipping-up/#findComment-589121 Share on other sites More sharing options...
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