Sir Sam Posted August 27, 2011 Share Posted August 27, 2011 New belt - $80 16 new rockers - $752(with shop discount) 116k on this belt, belt looked fine, I believe it skipped a tooth on the crank pulley, it REALLY fubared the exhaust rockers, and only moderately fubared the intake rockers. So 116k on this Jeep, only 16k past the change interval, after seeing this failure I see no reason to push the 100k change interval, in fact now I feel that much worse about pushing my own change interval to 113k on my own CRD. Bad rocker: Not as bad rocker: New rocker($47 each at my shop price): From front to back, worst, bad, new: Left to right, new bad worst: Worst bad new: Worst: roller pushed way down, seized, surface highly spalled: Bad: Roller pushed down: New: No play in roller bearings, roller height higher, surface somewhat rough from manufacturing: Left new, notice height of roller above rocker, protrudes about 1mm, right bad, roller surface about flush with rocker. Left new, right worst, roller collapsed to below rocker surface: Collapsed roller, spalled surface, cam wore grooves into the rocker metal: Compare to new: Notice height of new roller on new rocker(right): Bunch of bad ones laid out: Link to comment Share on other sites More sharing options...
JeepcoMJ Posted August 27, 2011 Share Posted August 27, 2011 yeah. not changing the belt at the proper interval is NOT a good think. in my experience, most vehicles with a timing belt are interference motors. you'd be lucky not to damage the valves. direct experience was with 2.1l turbo diesel in an 86 comanche. Link to comment Share on other sites More sharing options...
Sir Sam Posted August 27, 2011 Author Share Posted August 27, 2011 the VM 2.8 L is designed that should the valves impact the piston the rockers are what fails, not the valves. Pricey buggers though. Link to comment Share on other sites More sharing options...
JeepcoMJ Posted August 27, 2011 Share Posted August 27, 2011 the VM 2.8 L is designed that should the valves impact the piston the rockers are what fails, not the valves. Pricey buggers though. it's nice that engineers took that into account. typically, in my opinion, engineers over-think things and the end result is that common sense is never taken into account. is this on your motor, a project jeeps, or a customers? Link to comment Share on other sites More sharing options...
Sir Sam Posted August 27, 2011 Author Share Posted August 27, 2011 the VM 2.8 L is designed that should the valves impact the piston the rockers are what fails, not the valves. Pricey buggers though. it's nice that engineers took that into account. typically, in my opinion, engineers over-think things and the end result is that common sense is never taken into account. is this on your motor, a project jeeps, or a customers? This is a jeep I picked up to flip in new jersey. Link to comment Share on other sites More sharing options...
terrawombat Posted August 28, 2011 Share Posted August 28, 2011 Although the rockers weren't cheap, glad it wasn't something worse. Now you still have your spare CRD engine and can get back to work on that CRD MJ. That's going to be my next project after my 5.9L Magnum MJ project :D Link to comment Share on other sites More sharing options...
Thunderbear Posted August 28, 2011 Share Posted August 28, 2011 the VM 2.8 L is designed that should the valves impact the piston the rockers are what fails, not the valves. Pricey buggers though. That goes without saying for most everything about the VM, no? So this was the source of the odd noise, even though the timing belt looked fine, right? That said, I still want one. And now I'm seriously thinking about changing the timing chain on my 2.5 while I have the radiator off. Link to comment Share on other sites More sharing options...
Sir Sam Posted August 30, 2011 Author Share Posted August 30, 2011 Dr. Frederick Frankenstein: [to Igor] Now that brain that you gave me. Was it Hans Delbruck's?Igor: [pause, then] No. Dr. Frederick Frankenstein: Ah! Very good. Would you mind telling me whose brain I DID put in? Igor: Then you won't be angry? Dr. Frederick Frankenstein: I will NOT be angry. Igor: Abby someone. Dr. Frederick Frankenstein: [pause, then] Abby someone. Abby who? Igor: Abby... Normal. Dr. Frederick Frankenstein: [pause, then] Abby Normal? Igor: I'm almost sure that was the name. Dr. Frederick Frankenstein: [chuckles, then] Are you saying that I put an abnormal brain into a seven and a half foot long, fifty-four inch wide GORILLA? [grabs Igor and starts throttling him] Dr. Frederick Frankenstein: Is that what you're telling me? So the rest of my rockers came in today, actually several days early, after a quick dinner of a few pounds of chicken we hopped out to the garage and got to work, got the rockers in, the injector sealing surfaces cleaned up, the intake carefully put back on(this is nerve racking as its easy to knock the rockers off of their perches as nothing really holds them in place). Then injectors, fuel rail, wiring etc, and cranked it over. After a bit of cranking and me forgetting to connector the whatever it is on the back of the fuel rail it fired up and puttered nicely. So after only $1000 in parts it running, and just needs to be reassembled, interior cleaned, title paperwork done, then its up for sale! Link to comment Share on other sites More sharing options...
Sir Sam Posted August 30, 2011 Author Share Posted August 30, 2011 Although the rockers weren't cheap, glad it wasn't something worse. Now you still have your spare CRD engine and can get back to work on that CRD MJ. That's going to be my next project after my 5.9L Magnum MJ project :D I actually got a little bit of work done on the CRD MJ yesterday. the VM 2.8 L is designed that should the valves impact the piston the rockers are what fails, not the valves. Pricey buggers though. That goes without saying for most everything about the VM, no? So this was the source of the odd noise, even though the timing belt looked fine, right? That said, I still want one. And now I'm seriously thinking about changing the timing chain on my 2.5 while I have the radiator off. Yup, belt skipped, fubared rockers, and yes you do want one, want to buy mine? Can arrange delivery to alaska. Link to comment Share on other sites More sharing options...
87Warrior Posted August 30, 2011 Share Posted August 30, 2011 Good work. What's your estimated resale value going to be? I ask 1/2 interested since my wife used to want one but is now wanting a diesel pickup. If its too good to pass up, you never know... Link to comment Share on other sites More sharing options...
Sir Sam Posted August 30, 2011 Author Share Posted August 30, 2011 Good work. What's your estimated resale value going to be? I ask 1/2 interested since my wife used to want one but is now wanting a diesel pickup. If its too good to pass up, you never know... probably the 8-10k range. Link to comment Share on other sites More sharing options...
Sir Sam Posted September 1, 2011 Author Share Posted September 1, 2011 Spent today cleaning it inside and out, looking pretty sharp now: Link to comment Share on other sites More sharing options...
Automan2164 Posted September 1, 2011 Share Posted September 1, 2011 Price + delivery to Chicago? Rob Link to comment Share on other sites More sharing options...
Sir Sam Posted September 1, 2011 Author Share Posted September 1, 2011 Probably gonna list it at $9500 here locally, BBV is like 12,500, but I'm not sure I could get that. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now