Nissan Sentra with 72,000 miles. From my local mechanic shop.
See what happens when you don’t change the oil in your cars ladies.
Bustednuckles
Documenting The Death Of America
Nissan Sentra with 72,000 miles. From my local mechanic shop.
I remember a photograph in an old copy of Cars and Car Conversions of a Dolomite Sprint camshaft which had been sent by post to Piper Cams for reprofiling. It arrived in three pieces!
Not a lubrication issue, as far as I can tell…
Dropped???
I stand corrected, see it now.
Found the weak point….
That is shear beauty 😉
Wow! A rare, 4-cam, 4 cylinder.
Nice !
I actually had that happen on an ‘84 Dodge Daytona Turbo.
I changed oil at 3,000 mi or less, mostly to prevent wear on the turbo shaft. Driving along on the freeway, 70 or so, a small thump and the motor died.
No valve interference, so a new cam & back on the road.
good ol metal fatigue, I guess.
This happened to my wife while driving our Chrysler minivan (3.3 l). Just quit. One of the cams snapped, about 10k miles beyond warranty. Had always kept up on maintenance. Put a junkyard motor in it that never ran right and donated it to charity.
‘Had a ’97 Doge Intepid. The thing started leaking oil at 48K miles. ‘Started BURNING oil at 68K miles. Neither of these was due to lack of maintenance on my part. This was supposedly the Mercedes V6 engine… It was a piece of shit…
…Mopar won’t gofar…
That’s not due to lack of oil changes… The cam surfaces are MIRROR smooth. That’s just crappy metallurgy. “Made in China” comes to mind here…
Agree, Tom. The surface(s) of the cam indicate linear failure, an oil change wouldn’t create that kind of stress break. I’m no metallurgical genius but I’ve seen snapped, shear, and crack failure modes on metals. The most interesting ones are on metals that have been accidentally “tempered” by a fire and then later had force applied to them before failure.
The owner of Weigh Tek (where I worked as the Electronics Engineer) was a full Mechanical Engineering Professor at Gonzaga University and he let me read his books so I could understand better where to place the strain gauges and measure what was happening. I larnt lotz of inneresting thingys, I did…
Dual cams,do not see a problem,they are very common!
Looks like a fatigue failure to brittle fracture with the bright shiny faces. The brown arc from 12 to 2 on the right side piece may be the fatigue zone before the catastrophic brittle failure. I’d love to see good photographs of those surfaces.