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spankyjr1, Journeyman
Category: Small Engine
Satisfied Customers: 2597
Experience:  I worked on all types of equipment semis,forklifts,farm,ect
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I have a 404C-22. I am reassembling engine, and am finding

Customer Question

I have a 404C-22. I am reassembling engine, and am finding while timing, that once idler gear is installed, engine is extremely hard to rotate over (by hand, no pistons installed yet), is this normal, or what could be causing this.
Crank gear is new, idler and cam are original. Crank rotates smooth and easily by itself.
Submitted: 1 year ago.
Category: Small Engine
Expert:  spankyjr1 replied 1 year ago.

Hi and welcome thank you for requesting me.

Is fuel pump on?

Why is engine being built or what was the failure?

Let me know

Expert:  spankyjr1 replied 1 year ago.

You are going to have resistance from injection pump, so this is normal.

As long as engine crank turns smooth and does not lock up you should be good as long as the failure was not cam or pump related.

The springs inside injection pump are about the same size as valve springs and must compress to inject fuel.

Just turning injection pump by hand is difficult.

Let me know if you need anything else.


Customer: replied 1 year ago.
Nothing is on the engine yet, no injection pump, no tappets, no pistons and rods. Bare crank, bare cam, both roll freely independantly.
Original failure was con-rod bearing on #3 cylinder.
Expert:  spankyjr1 replied 1 year ago.

Then I would change the other gears just to be safe.Cam and idler gear.

Sometimes you can get away with just one gear but if they don't mesh smoothly all drive gears should be replaced just to be safe.

Customer: replied 1 year ago.
I'm sure that that is not the issue because I would have more clearance between the teeth.
Expert:  spankyjr1 replied 1 year ago.

Did you check gear pattern with Blue?

How much backlash do you have?

To much or to little clearance with a poor tooth contact could be the problem.

Customer: replied 1 year ago.
That would not resolve the problem, this is not an adjustable mesh gear system like a differential, unless you know something I don't about this engine?
Expert:  spankyjr1 replied 1 year ago.

Its got straight teeth that does not mean there is no pattern!

If its to tight,,going to deep,only hitting on part of tooth you will see that with blue!

I've built hundreds of engines and transmissions with straight teeth it does make a difference.

Customer: replied 1 year ago.
I understand that, but, if it is an uneven mesh, how would it be resolved? There is no way to adjust the gear mesh. I am going to try to remove the gear from the original crank today and put on new one to see what happens.
Expert:  spankyjr1 replied 1 year ago.

That will confirm you need to replace other gears as a set.