h3 - AllisChalmers Forum

Have you tested the RPM at full throttle? I believe governed RPM is 2000. You would always be able to speed it up by manually moving the linkage against the spring tension in the governor. You would be able to speed it up much higher than 2000 that way.

Currently- WD,WC,3WF's,2 D14's B. Previously- I 600,TL745,200,FL9,FR12,H3,816 LBH. Earth has no sorrow that Heaven cannot heal!

Rated/full load speed of 2,000 RPM means the no-load high idle speed is 2,200 to 2,250 RPM.

that sounds good. cheap!

High Idle is No load maximum RPM, governor Limit.

Will add, as a industry standard, for those engines with advance mechanisms, this keeps those on the Idle low power control components of governor at No advance.

Edited by DMiller - 27 Mar 2024 at 5:40am

High idle of 2200-2250 RPM. Low idle of I suppose 400 to 450 RPM.

Thank you for the reply Fred. I'll give it a try, currently waiting on a tachometer.

Understanding how to adjust and get proper spring tension on spring for high idle is must other wise tachometer is useless .A shop manual has all this in it including complete adjustment of Gov. D-15 is same .

All the H 3 and HD3 I seen had tacks .

Edited by Fred in Pa - 29 Mar 2024 at 6:30am

He who dies with the most toys is,
nonetheless ,still dead.
If all else fails ,Read all that is PRINTED.

DrAllis wrote:

Ignition timing advance mechanism is strictly RPM activated. It cannot and does not sense what the engine load is. The advance's "curve" is designed to work with the engines compression ratio and performance at low speed for best lugging ability.

Yup. Unless there is some sort of vacuum sensing apparatus, which I don't believe these engines have.

Thus my confusion/misunderstanding/misinterpretation of DMiller's statement above Confused

Fred

Haven't did anything for a couple of days, Cold and raining here. I got tach, and high idle is seventeen hundred and low is eleven hundred. There is very little response between the two. I know i can get idle down on carburetor but see know way to raise top end. Would like about 2000rpm'

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