Need Torque Setting for DT140 Intake Help Please

[fishingidaho]

I need help please on the torque setting for the intake nuts on my 1998 DT140
I have the service manual and I cannot find this torque setting anywhere in it?
I replaced the reeds and gaskets all I have to do it torque the intake and hook everything up.

[Murray]

On my manual(2009 DF90) about 20 pages in, following the error codes, I have a page with all the torque specifications. MY torque specifications for the “Intake Manifold bolt/nut 23 N.M or 16.5 lbf.ft “ Thread diameter is 8mm. If your threads are 8mm then I would think 23N.M would be close. I would hold off using my numbers until another member can confirm or dispute.

[fishingidaho]

Thanks Murray
there are several torque spec charts in the manual for the DT 115/140
But there is nothing listed for the intake manifold?
Grrrrrrrr...
Hopefully someone else can confirm

[Solarman]

In my book, pg #14, it gives a list of torque specs, and if the intake torque is not listed, at the bottom of the same page are additional torque specs depending on the size & type bolts used.

You will need to match up the markings, size, thread count for each bolt to get the proper torque specs for the intake.

Good luck.

[fishingidaho]

20201028_050129.jpg

[fishingidaho]

Yes, I see this from manual. However, no intake manifold torque is given and the intake has studs not bolts ???
crazy that they don't provide such useful info?

[briscoe]

Intake manifold.jpg This is what I have on my DF140. This would be for 2002-2012. Don't know why yours would be different, even if it's a '98. This is the same info Murray put up. Good job Murray.

[fishingidaho]

Briscoe,
Thank you,
I was just unsure if torque would be different because of 2 stroke vs. 4 stroke on the intakes? You wouldn't think so? but Suzuki did some unorthodox engineering on these 2 strokes.

[briscoe]

Nah, same torque. I think Suzuki loved this motor and changed very little through its evolution into 4 stroke. I really bought it cause my 20'-2" boat didn't need a 150. I can see why you have kept your 98. They are an excellent engine. I hope my 07 makes another 8 or 9 years. I dread the conversion to fly by wire for newer motors. Not running with it, but removing all that garbage and mucking with a new wire harness

[fishingidaho]

Thank you to all who responded!

I torqued to 16 ft. lbs. and I am almost done getting it back together after replacing the reed valves.
We still have about a week of warm weather here, so I should have the muffs on today for checkout and then dunk it tomorrow for a run.
Appreciate the info.