Lifter failure
A couple of years ago a builder in town had his first flat tappet cam/lifter failure.
Mild 440 build, smaller Summit cam(.442/.465), USA made Hylift Johnson lifters, stealth heads with the as supplied springs, oe rockers.
Broken in on the dyno with Driven BR oil.
Lasted less than 2000 miles.
The symptom was a skip and popping thru the carb.
Pulled the V/C, found an intake pushrod had failed.
It had been rebuilt previously and had a few “parts store” type pushrods in it, and it was one of those that failed.
So, he orders a set of decent pushrods for it and put it back together.
The skip is sort of gone, but sort of still there, and a lifter is ticking. It’s the exhaust for the intake that had the bent pushrod.
I get a call……… “the lifter won’t pump up”.
I tell him…….”that lifter has a hole in the bottom of it”.
He didn’t think I was right…….. but then he sent me this:
Supposedly the cam still looked fine, and the other 15 lifters were fine.
It was near the end of the season and it wasn’t going to be properly repaired before the season was over.
So……..One new lifter was installed(partially just to make the vehicle mobile again)……… and it’s still running fine 2 years later.
A couple of years ago a builder in town had his first flat tappet cam/lifter failure.
Mild 440 build, smaller Summit cam(.442/.465), USA made Hylift Johnson lifters, stealth heads with the as supplied springs, oe rockers.
Broken in on the dyno with Driven BR oil.
Lasted less than 2000 miles.
The symptom was a skip and popping thru the carb.
Pulled the V/C, found an intake pushrod had failed.
It had been rebuilt previously and had a few “parts store” type pushrods in it, and it was one of those that failed.
So, he orders a set of decent pushrods for it and put it back together.
The skip is sort of gone, but sort of still there, and a lifter is ticking. It’s the exhaust for the intake that had the bent pushrod.
I get a call……… “the lifter won’t pump up”.
I tell him…….”that lifter has a hole in the bottom of it”.
He didn’t think I was right…….. but then he sent me this:
Supposedly the cam still looked fine, and the other 15 lifters were fine.
It was near the end of the season and it wasn’t going to be properly repaired before the season was over.
So……..One new lifter was installed(partially just to make the vehicle mobile again)……… and it’s still running fine 2 years later.