Nanni Diesel, sticky throttle

[Channel Ribs]

A chap down our way is having problems with his engine revs, to get them over about 2000RPM takes some considerable physical effort on the throttle lever.

I had a quick look and disconnected the lever to check that it moves freeley and also both ends of the control cable, both of which are fine.

I am guessing the throttle arrangement at the engine end is to blame, but would welcome any insight.

 

[Kawasaki]

If the problem has arrived without any previous alterations or meddling etc at the engine end. I would suspect the cable condition.
Check the cable at it's most "bent" point ie where it changes direction most severly at the control box end and tother end.
With the cable disconnected at the throttle end check how free it feels.
Experience over the years with motorcycles and scooters was however the cable "looked" when getting on a bit ,stiffness and poor feel was usually down to the cable casing innards wearing in the areas the cable has to turn.
With the cable disconnected at the eng end work the throttle lever whilst holding on to the inner with a pliars or summat to check the Throttle control/ cable operation independantly.
Thus eliminating a prob at the eng/pump end.
Tiss a job for 2 peeps or a contortionist! /forums/images/graemlins/blush.gif
Try squirting some luby stuff down the cable. Not a fix but if there is any improvement, proves the cable is a fault and not the box or the pump end.
Has the symptom suddenly arrived or has it worsened over time?

 

[Channel Ribs]

[ QUOTE ]
With the cable disconnected at the throttle end check how free it feels.

[/ QUOTE ]

Did that, the cable is fine. Not sure how long it has been developing, I only get a call when something falls off. /forums/images/graemlins/smile.gif

 

[Kawasaki]

If the cable is ok then suspect the control box.
Plus have You checked the operation of the "fuel lever arm" at the pump end whilst disconnected from the cable?
Is it performing it's full movement. Tried it whilst running and not running?
Sometimes control cables feel ok whilst not under load, yet struggle to work smoothly when pulling on something like a fuel pump arm/ throttle lever etc.
Outer cables can shrink over time and knacker up the range ie the inner becomes longer therefore it don't pull the same!
Do we have a "Morse" type control or a Nanni type?
Question and answer session continues, Over!

 

[Channel Ribs]

Aye, I checked the control box too and that was fine and dandy. /forums/images/graemlins/frown.gif

It looks allot like the fuel lever arm.

 

[Aja]

Unless I'm missing something, have you tried disconnecting the cable from the engine throttle and trying to rev the engine using the lever on the engine?

Donald

 

[Channel Ribs]

[ QUOTE ]
have you tried disconnecting the cable from the engine throttle and trying to rev the engine

[/ QUOTE ]

Sorry, my fault - I am not being very clear (too much time talking to Kawasaki /forums/images/graemlins/smile.gif) I have tried the unadorned throttle and it is indeed hard work, but am at a loss as to what this means.

 

[Kawasaki]

Answer 2 contained that question!
Answer off Malthouse confirmed the answer lies in the throttle lever at eng end.
Question is whats up with pump/lever/throttle?
Answer I don't know without being on the spot.
Spot on diagnosis from a distance is not the answer.
Questionably the answer may be to remove the pump and take it to Pump Man for diagnotion and the Final Answer! /forums/images/graemlins/tongue.gif /forums/images/graemlins/grin.gif

 

[Channel Ribs]

[ QUOTE ]
...remove the pump and take it to Pump Man for diagnotion and the Final Answer! /forums/images/graemlins/tongue.gif /forums/images/graemlins/grin.gif

[/ QUOTE ]

Eeeek, have the seen the pump men round these parts? /forums/images/graemlins/blush.gif

Surely it would be easier to hit it with a hammer myself. /forums/images/graemlins/laugh.gif

 

[Kawasaki]

Well you could try the knockometer method.
Havn't stripped a Nanni one myself so can't advise.
If the fuel arm spindle is removable without too much trauma ,perhaps we have another answer.
Answer Me this. How old ,what Year is Our Chappies unit?
I have used the following method in the past to test such a prob.
Go afloat, disconnect the cable and whilst one bod is at the helm, tother bod becomes the cable and manually shoves the lever. This confirms the pump is performing properly +tests the Helmsan's awareness and observation skills.
Especially if dialogue + verbal continuety between the Cable Man and Helmsman becomes fraught!
Pump Man? Use the local Wagon/ Commercial man on the Local ind estate.
Last overhaul I had done to a Ford Mermaid pump. Actually it was a Bosch or maybe Simms was £120 but that was a Full Monty service and the old Ford reacted like it had given up smoking (think I should as well!)
But then again You can't beat the old Tapometer. In Expert hands that is! /forums/images/graemlins/grin.gif

 

[davidbains]

I managed to free a sticky/corroded fuel lever arm on my Yanmar2GM20 this summer, and conti nued using the original Morse control wires. WD40 and brushing and patience freed up the arm, without dismantling.