How tight do you go?

[RenkenII]

I'm putting in my Sierra Impeller pump (complete Kit) and I'm unsure how tight to tighten to nuts on the pump? My SELOC manual says 25 ft lbs for the 7/16 nuts and 35 ft lbs for the 1/2 nut. I started tightening, tightening and my wrench didn't pop. The nuts are tight with a hand wrench, can someone guide me on this? Don't want it to tight as read that will cause trouble and I don't want it too loose. I just don't want to crack the plastic housing.

Thanks for the time gents.

 

[ziggy]

Re: How tight do you go?

at the very least, get your info here. from an oem s/m. if ya tell us what ya got, someone may be able to provide ya with a pdf link to what ya need.

says 25 ft lbs for the 7/16 nuts and 35 ft lbs for the 1/2 nut

from that statement, i'm guessing a alpha1 type drive.
i'll be them specs are close if ya read it in. lbs. not ft. lbs. as in 25 in lbs. and 35 in lbs... for my mc-1 (pre alpha1 if ya want) there are three specs, 15,30 and 35 in lbs. depending on which bolt or nut i am tightening.
if ya got something other than a mercruiser, use whatever oem book covers your drive for service and specs.

 

[Don S]

Re: How tight do you go?

Here is what it says in service manual #6 for your drive.
Your Seloc is wrong about everything if it says 25 and 35 ft lbs., it's 60 to 80 INCH LBS.
25 ft lbs, will damage/distort the plastic housing and it would suck air.

EDIT: Adding links to manuals, site wouldn't come up earlier.
Engine http://www.4shared.com/office/C6-RE1dd/08__MCM_4_cyl85-89___470_.html?
Drive http://www.4shared.com/office/L17_ufPa/06__Drives_R-A1_83-90.html?

 

[ktbarrentine]

Re: How tight do you go?

I'm putting in my Sierra Impeller pump (complete Kit) and I'm unsure how tight to tighten to nuts on the pump? My SELOC manual says 25 ft lbs for the 7/16 nuts and 35 ft lbs for the 1/2 nut. I started tightening, tightening and my wrench didn't pop. The nuts are tight with a hand wrench, can someone guide me on this? Don't want it to tight as read that will cause trouble and I don't want it too loose. I just don't want to crack the plastic housing.

Thanks for the time gents.

Wow! Careful, or you WILL break something! My OEM manual (for my alpha 1) says nuts torqued to 60-80 INCH pounds (NOT ft pounds!), and the screw is 30 - 40 INCH pounds. I have heard nothing good about SELOC manuals, Except they are good for propping up the sofa when a leg breaks off. Just sayin. I got my OEM manual from a link on here.
(There we go again, Don! Posting at the same time!.... Most of what I have learned has been from you and this forum, anyways! Thanks!!!!)

 

[RenkenII]

Re: How tight do you go?

Thanks for the help everyone. Sorry, my signature din't work, I have a Alpha One Gen 1 mounted to a 470. I don't have a inch metered torque wrench, I'll have to get ahold of one.