Bf75 (7.5Hp) torque & sequence

corbierev

Recruit
Joined
Jan 1, 2008
Messages
2
I am replacing the head gasket of my Bf75 and need to know the bolt tightening sequence and torque. It's late 80's, one of the last of the points models.
Regards, David.
 

JUSTINTIME

Captain
Joined
Sep 2, 2006
Messages
3,284
Re: Bf75 (7.5Hp) torque & sequence

send me a pm and i can get you that page out of my manuals
 

Lakester

Chief Petty Officer
Joined
Nov 17, 2007
Messages
428
Re: Bf75 (7.5Hp) torque & sequence

hello,

no doubt u will get the specs offered...

but in the case of no specs or diagrams... here is what u can do.

working from the center to the outside, or center to top then back to next on bottom, then top up, then next to next bottom, etc [well u get idea] avoid the idea of "bolting the head on"

think of "drawing the head bolts down". using that sort of a sequence... just add a few ft pounds each time. key is to take it slowly. with a reasonable sequence... inside to out, if in doubt... and a small amount of torque each time... hard to go wrong. a pound at a time is not unreasonable when in the dark... :)

a 5/16ths head bolt... usually will be torqued to 20 - 22 ft lbs... clean threads in block and bolt... and light engine oil in threads and under bolt head. 3/8s usually goes up to 35 ft lbs and 7/16th can run 65... and 1/2" can run 85 - 100 ft lbs...

just be sure to draw down the bolts slowly so as to put a uniform clamp load on gasket and head or plate. :D

regards
lakester :cool:
 

flashback

Captain
Joined
Jun 28, 2002
Messages
3,976
Re: Bf75 (7.5Hp) torque & sequence

Im looking at the manual right now, there are 6 head bolts, start with the center 2, then work your way toward each end, one at a time alternating from left to right..basicly a zig-zag... the specs are 14.4-20.2 lb-ft..hope this helps..
 

Lakester

Chief Petty Officer
Joined
Nov 17, 2007
Messages
428
Re: Bf75 (7.5Hp) torque & sequence

Im looking at the manual right now, there are 6 head bolts, start with the center 2, then work your way toward each end, one at a time alternating from left to right..basicly a zig-zag... the specs are 14.4-20.2 lb-ft..hope this helps..

:)

lakester :cool:
 
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