Rebuilding motor new cam or not?

1223 Views 7 Replies 6 Participants Last post by CBMSGOSS, May 24, 2007

CHADGOSS

Discussion Starter · May 20, 2007

Here the deal had a motor rebuilt, was supposed to have a new cam and crank. Well he decided the old cam with 350k miles was still good, less than .001 of wear. He is telling me the cam is billet steel and the cam is usually not replaced in these motors. Is that true? Thanks for any input.

Save

1 - 1 of 8 Posts

Garbage_Mechanic

· #6 · May 23, 2007

In my experience with diesel engines with roller cam followers it is the roller bearing that is the fail point. The only cam I have lost in a similar motor as this was a 6.9, 290,000 miles, roller siezed, took out cam. Also another 7.3, same issue. If it were me I would replace the lifters. That is a lot of revolutions on those little wheels! There is not a cam/lifter worn in to each other/ don't swap or replace/ type situation on roller lifters since there is only rolling contact.

Mine: 91 F250 Reg Cab 4x4 5spd 7.3IDI 4.10LS 145,000 miles. Banks Sidewinder 92 D60 F axle w 97 brakes and Powerlock. Lift: about 4" over stock 250. 33x12.50x16.5 Pro Comp MTs Magnaflow 12" muffler. Sees dirt everyday. Used to haul hay, wood, feed cows, check fence.
Hers: 96F250 CCSB 7.3 PSD 4x4 5spd 3.55 LS 190,000 miles. Puchased 7/03, Looked for a 5spd CCSB for a year!Dana 60 front axle, at stock F350 height (for now) Energy Poly bushings, Bilsteins, 305/70/16 Pro Comps on 16x10 Weld Outbacks, AFE Pro7,TYMAR 3x3.5x4 downpipe,TYMAR 5" straightpipe, gutted EBV, IH Non EBV pedistal,New Alliant AC Injectors,(stage 1)Cal reg kit, SBC Con O clutch, permenent clutch bushing fix, AC mod with a different twist, AMP Powersteps with custom brackets and wiring(one of 2 OBS trucks with them according to AMP) Line of Fire. Sees dirt everyday.
My Company pickup: 86 F250 6.9 C6 320,000 miles Co trucks 5 89 to 94 IDI's, plus about 50 more diesels.
Diesel Mechanic 34 yrs Maintenece Manager 23 yrs

Save

1 - 1 of 8 Posts

This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.

Top Contributors this Month