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missing cam pulse

Posted: Mon May 06, 2019 5:53 pm
by kenlink
I have a Generac 22KW Model# QT02224 ANAX ….. Cranks for about 8-10 seconds... On screen says "MISSING CAM PULSE" … Any help.. Thanks, Ken

Re: missing cam pulse

Posted: Mon May 06, 2019 5:58 pm
by Chris
Hey Ken,

It's usually the front mag pickup that causes issues. It's screwed into the upper timing cover. It's a magnet, so it, or the magnetic pin on the cam wheel can have metal debris stick and cause signal issues.

You can remove the coil pack bracket and upper plastic timing cover and see it with a flashlight.

Rotate the engine by hand to line up the cam pin with the pickup and verify that there is .015 air gap between the two.

Mag pickup can be seen here https://shop.gentekpower.com/products/g ... uid-cooled

Resistance can be measured at between 900-1100 ohms or so with most of them being around 990 ohms.

Hope this helps!

Re: missing cam pulse

Posted: Mon May 06, 2019 6:14 pm
by kenlink
Thank you, I will give it shot... Thanks

Re: missing cam pulse

Posted: Tue May 07, 2019 2:48 pm
by kenlink
Hi Chris, Looks like I need to take the outside cabinet off to get to these parts is that correct.. Thanks for help again.. Looks like bolts on the bottom attached to frame...

Re: missing cam pulse

Posted: Tue May 07, 2019 9:18 pm
by Chris
No, no. This is all at the top of the engine at the front. No need for any major disassembly!

Re: missing cam pulse

Posted: Fri May 10, 2019 10:32 pm
by kenlink
Hi Chris, Thank you for pointing me in the right direction... I replaced the mag pickup part# OD2244M and gapped it At .015 and it started right up!!!! Also I did need to remove cabinet (12 bolts) everything else was as you said.... Thanks again, Ken

Re: missing cam pulse

Posted: Sat May 11, 2019 12:02 am
by Chris
Glad to hear you got it fired back up!

Re: missing cam pulse

Posted: Thu Sep 26, 2019 12:22 pm
by spaknives
Hello, I have almost the same generator throwing the same alarm. I did what you said and pulled the upper timing cover. Here is a picture of what I see. Is this fear suppose to have a belt on it?

Re: missing cam pulse

Posted: Thu Sep 26, 2019 12:43 pm
by Chris
spaknives wrote:
Thu Sep 26, 2019 12:22 pm
Hello, I have almost the same generator throwing the same alarm. I did what you said and pulled the upper timing cover. Here is a picture of what I see. Is this fear suppose to have a belt on it?
Yes, that's the camshaft pulley. That engine may be done... :sad:

The valves have probably crashed into the pistons bending the valves and denting the pistons. Best case scenario would be a head rebuild at a local engine shop with new valves, worst case is engine swap... Depending on the cost of the engine (I can price for you) it might be cheaper to swap than to repair the head.

Re: missing cam pulse

Posted: Thu Sep 26, 2019 4:51 pm
by spaknives
Chris wrote:
Thu Sep 26, 2019 12:43 pm
spaknives wrote:
Thu Sep 26, 2019 12:22 pm
Hello,
Yes, that's the camshaft pulley. That engine may be done... :sad:

The valves have probably crashed into the pistons bending the valves and denting the pistons. Best case scenario would be a head rebuild at a local engine shop with new valves, worst case is engine swap... Depending on the cost of the engine (I can price for you) it might be cheaper to swap than to repair the head.
Oh man, that is what I figured. Could you please give me a price on an engine? Serial # 3002639542