Thru bolts and torque sequence & oil pump cover
Posted: Mon Sep 03, 2012 3:50 am
Hello everyone,
I'm the guy that was lucky enough to find the cracked lifter bodies in my C-145.
I have gotten all the parts back from the various FAA repair stations and we are getting ready to put the engine back together. I have read the overhaul manual several times and am unsure of how to torque the case halves together. My concern is that I don't want to possibly spin the main bearings when I torque the thru bolts on the cylinders. I called Continental and asked if a service bulliten existed that would show a torque sequence diagram. The tech person indicated that nothing of that sort existed. The manual calls for tightening the flange bolts, bottom thru bolts and then install the cylinders. Would it be prudent to install all the cylinders (loosely not torqued) first and then after all cylinders are installed torque the cylinder thru bolts without moving the crank shaft? Is there a risk that a main bearing could shift out of position with just the lower thru bolts and the flange bolts torqued? I was thinking that I could put a stack of washers on the cylinder thru bolts and torque them down without the cylinders installed and then put one cylinder on torque to spec go to the opposit side of those thru bolts and install that cylinder and torque that one to spec. I think I'm getting a bit rapped around the axel on this one but don't want to take the risk of wrecking a good engine.
When putting the oil pump cover on should I use Locktite 515 gasket eliminator? The manual says nothing about using a sealant but Continental SIL 99-2B says to use it (all models). Again, I talked to the Continentl service rep but he was unsure. I dont want to get the Locktite into the gears. I did use machinest blue to check the fit of the cover to housing and it was a perfect fit, no gaps.
Thanks for the help!
Thad
I'm the guy that was lucky enough to find the cracked lifter bodies in my C-145.
I have gotten all the parts back from the various FAA repair stations and we are getting ready to put the engine back together. I have read the overhaul manual several times and am unsure of how to torque the case halves together. My concern is that I don't want to possibly spin the main bearings when I torque the thru bolts on the cylinders. I called Continental and asked if a service bulliten existed that would show a torque sequence diagram. The tech person indicated that nothing of that sort existed. The manual calls for tightening the flange bolts, bottom thru bolts and then install the cylinders. Would it be prudent to install all the cylinders (loosely not torqued) first and then after all cylinders are installed torque the cylinder thru bolts without moving the crank shaft? Is there a risk that a main bearing could shift out of position with just the lower thru bolts and the flange bolts torqued? I was thinking that I could put a stack of washers on the cylinder thru bolts and torque them down without the cylinders installed and then put one cylinder on torque to spec go to the opposit side of those thru bolts and install that cylinder and torque that one to spec. I think I'm getting a bit rapped around the axel on this one but don't want to take the risk of wrecking a good engine.
When putting the oil pump cover on should I use Locktite 515 gasket eliminator? The manual says nothing about using a sealant but Continental SIL 99-2B says to use it (all models). Again, I talked to the Continentl service rep but he was unsure. I dont want to get the Locktite into the gears. I did use machinest blue to check the fit of the cover to housing and it was a perfect fit, no gaps.
Thanks for the help!
Thad