DCELL
Veteran Member
I'll try to make a long story short.
The car I am currently working on is the first I've seen that actually had timing belt strip itself and then the owner restarted it and let it run trying to figure out what was wrong with it. I've had others with suspected "slipped timing" or tensioner failure, but never one where my piston protrusion measurements didn't match up. As there are slight impressions from valves on the piston tops, I was suspecting the worst.
I used a variety of measurement techniques to try to determine what was going on with these pistons. I used both a magnetic dial base and a magnetic deck bridge as well as checking with both a dial gauge and caliper. Measured at the thin shoulder above the wrist pins after a conversation with franko6.
What I found was (left/right): #1=.041/.040, #2= .039/.040, #3 .039/.040, and #4 .042/.035
After measuring more times than will admit, I pulled #4 and #3 pistons for inspection, as I understand rods are weight and length matched in reciprocating pairs. What I don't know is what I'm looking at? Both of these rods look identical, and neither look bent to my eye. I don't have a surface plate at my disposal.
MY Question:
Is there any other way I can quickly determine the status of these rods without sending them to Frank? It's not that I don't want to send them out, it's more of an issue of time. He's already got the head rebuilt and on the way back to me.
Can anyone tell me in what way rods "normally" bend in a valve collision?
Many thanks!
The car I am currently working on is the first I've seen that actually had timing belt strip itself and then the owner restarted it and let it run trying to figure out what was wrong with it. I've had others with suspected "slipped timing" or tensioner failure, but never one where my piston protrusion measurements didn't match up. As there are slight impressions from valves on the piston tops, I was suspecting the worst.
I used a variety of measurement techniques to try to determine what was going on with these pistons. I used both a magnetic dial base and a magnetic deck bridge as well as checking with both a dial gauge and caliper. Measured at the thin shoulder above the wrist pins after a conversation with franko6.
What I found was (left/right): #1=.041/.040, #2= .039/.040, #3 .039/.040, and #4 .042/.035
After measuring more times than will admit, I pulled #4 and #3 pistons for inspection, as I understand rods are weight and length matched in reciprocating pairs. What I don't know is what I'm looking at? Both of these rods look identical, and neither look bent to my eye. I don't have a surface plate at my disposal.
MY Question:
Is there any other way I can quickly determine the status of these rods without sending them to Frank? It's not that I don't want to send them out, it's more of an issue of time. He's already got the head rebuilt and on the way back to me.
Can anyone tell me in what way rods "normally" bend in a valve collision?
Many thanks!