Eccentric shaft end play
#1
Waiting
Thread Starter
Eccentric shaft end play
So I recently bought a large street port S4 T2 engine that had cracked a rear iron while on the dyno. I had the engine take apart, inspected and the rear iron replaced. Everything else was okay. This was sort of a rush job as I had to make it to track the weekend after. The engine runs great and I have no issues with it at stock boost.
My concern is that when we measured the E shaft end play, it was just barely out. Spec is 0.04mm to 0.07mm and mine was measured at 0.074mm. Should I be concerned? I want to raise boost to 12psi but don't want to at the expense of another engine. The rotor housings on this engine are pretty much brand new.
thanks for your time fellas!
My concern is that when we measured the E shaft end play, it was just barely out. Spec is 0.04mm to 0.07mm and mine was measured at 0.074mm. Should I be concerned? I want to raise boost to 12psi but don't want to at the expense of another engine. The rotor housings on this engine are pretty much brand new.
thanks for your time fellas!
#2
Engine, Not Motor
iTrader: (1)
Join Date: Feb 2001
Location: London, Ontario, Canada
Posts: 29,789
Likes: 0
Received 108 Likes
on
91 Posts
Did you take this measurement during assembly?
That is only barely out of spec, but it won't ever get tighter from there, only looser. Will probably run for YEARS like that however with zero consequence. Likely forever.
If it was me and I had just gone through all the work to assemble everything in the engine bay, I'd just leave it and wait for a weekend when I was very bored and could go in there and replace the bearings and spacer.
That is only barely out of spec, but it won't ever get tighter from there, only looser. Will probably run for YEARS like that however with zero consequence. Likely forever.
If it was me and I had just gone through all the work to assemble everything in the engine bay, I'd just leave it and wait for a weekend when I was very bored and could go in there and replace the bearings and spacer.
#4
Moderator
iTrader: (3)
Join Date: Mar 2001
Location: https://www2.mazda.com/en/100th/
Posts: 30,789
Received 2,569 Likes
on
1,828 Posts
the measurement you get depends how you measure it, if you were using a big prybar and were .004mm on the loose end, i think its fine. if you were just pulling it by hand and its out by .004mm it is more worth looking into, but i still wouldn't be in a hurry.
its freeplay, literally, so if you're using a big prybar, you're going to get a bigger measurement, than if you just go by hand.
its freeplay, literally, so if you're using a big prybar, you're going to get a bigger measurement, than if you just go by hand.
#6
Waiting
Thread Starter
Did you take this measurement during assembly?
That is only barely out of spec, but it won't ever get tighter from there, only looser. Will probably run for YEARS like that however with zero consequence. Likely forever.
If it was me and I had just gone through all the work to assemble everything in the engine bay, I'd just leave it and wait for a weekend when I was very bored and could go in there and replace the bearings and spacer.
That is only barely out of spec, but it won't ever get tighter from there, only looser. Will probably run for YEARS like that however with zero consequence. Likely forever.
If it was me and I had just gone through all the work to assemble everything in the engine bay, I'd just leave it and wait for a weekend when I was very bored and could go in there and replace the bearings and spacer.
I may do just that actually, probably when I have the car painted, might as well do the engine bay too.
Doesn't chatter! Looks like I'm in the clear, haha
the measurement you get depends how you measure it, if you were using a big prybar and were .004mm on the loose end, i think its fine. if you were just pulling it by hand and its out by .004mm it is more worth looking into, but i still wouldn't be in a hurry.
its freeplay, literally, so if you're using a big prybar, you're going to get a bigger measurement, than if you just go by hand.
its freeplay, literally, so if you're using a big prybar, you're going to get a bigger measurement, than if you just go by hand.
I figured it wouldn't matter much but again, there's so many opinions on end play that I wasn't sure what to think of it. I guess some people like it on the tighter end and some people like it on the looser end.
Thanks for the replies fellas, now I can sleep soundly at night