D722 Oil pump torque?

[primerk5]

I don't have a service manual for this engine. I did however find a manual online that i could look at. That manual pic below states its supposed to have a torque of 13 to 15.9 ft pounds which seems like a lot.

I looked in the manual I have for my D950 and it is like 9 ft pounds tops.

Can anyone confirm this. I think i'm going with what the D950 says it should be as i think i might have warped the pump when I installed it trying to bring it up to torque recommended in the 722 manual. I'm going to have to get a new one now.

Also, What is meant in the manuals when it says 13 to 15 ft pounds of torque for the torque value? Is it anywhere between there? or is that the initial torque and the the final torque. It seems kind of weird, and nowhere in the manuals does it describe how to interpret that.

Thanks for any help

 

[Dr Honda]

Yes... 13 to 15 Lb/ft is the range. Generally, I would torque to the lower spec, and then re-torque to the top spec. That way you have a nice even pressure. But anywhere in that spec is fine.


As far as being "A lot" of torque... 15 Lb/ft is really not much. The spark plug of your push mower will be more than that.

 

[Tooljunkie]

If im not sure of a bolt torque i refer to a torque chart for hardware. 13 foot pounds as mentioned isnt much.
My torque wrench doesent go that low, i use inch pounds. Just multiply by 12. 13 being 156 inch pounds.
Then i go up in two steps. 100 then 156.

 

[primerk5]

It just seemed like alot to me compared with the other engine that contains a similar oilpump. i wasn't sure how much torque a 2.5 in 6mm bolt can actually take.

 

[Russell King]

You can't just assume one torque value for one bolt size. Bolts come in various grades that indicate the strength of the bolt.

In metric world there are grades like 8.8 and 12.9 similar to the SAE grades of 5 and 8.

The material the bolts thread into also have a lot to do with what torque they can be tightened to.

The bolts in Japanese equipment may have a number stamped on their head. These are notations to the assembler of how much torque to apply to the bolts - you have to find the manufacturer's tables to know that and those are hard to find.

Anyway - use the values in the table and you will be fine. Notice they are all about the same amount of torque (the metric values are just a factor of 10 compared to each other so that means the units have a factor of 10 somewhere in them).

I am not sure what you mean by "warping the pump". It looks like it fits against a flat surface so you should tighten each bolt a little at first (25% of the final value?) to seat the faces together then tighten each bolt to about 50% of the final value, then go to final torque value.

 

[primerk5]

As I was spinning the pump over while I was cleaning it I'm pretty sure it was spinning nice and smooth. After applying the recommended torque, I couldn't get the pump to spin to install the gear. I removed the pump and it then had spots in its rotation where it would stick some. I'm assuming that something was damaged as a result.

 

[Tooljunkie]

I would suggest criss-cross pattern when tightening and check pump rotation as you turn it. Also lubricate pump with engine oil before installing. Old school was to pack them with petroleum jelly so they would not cavitate on first start