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Old 01-24-2022, 02:51 AM   #1
richURVAN
 
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Default Z24 engine best way to disable the fuel for compression test??

Hey folks,

Need to run a compression test on my Z24 engine, first time doing a compression test and first time working with a carburettor. Assuming it's a mechanical fuel pump so no good looking for a fuse to take out.

Is pulling the fuel line off the carb going to be the easiest way and redirecting it into a container? If so which hose is the fuel feed?

Appreciate any help.

Ta,
Rich
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Old 01-24-2022, 11:15 AM   #2
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Disconnect the fuel line from the input of the fuel pump and plug the line.
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Old 01-24-2022, 01:26 PM   #3
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Pull the fuel pump fuse/relay.
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Old 01-25-2022, 01:29 AM   #4
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Quote:
Originally Posted by richURVAN View Post
Hey folks,

Need to run a compression test on my Z24 engine, first time doing a compression test and first time working with a carburettor. Assuming it's a mechanical fuel pump so no good looking for a fuse to take out.

Is pulling the fuel line off the carb going to be the easiest way and redirecting it into a container? If so which hose is the fuel feed?

Appreciate any help.

Ta,
Rich

I am more interested as to how one would compression test a engine with (2) plugs per cylinder??????

The Z24 has 2 per cylinder, right?

You just leave one of the two plugs in?

Seriously interested in how this is done on this engine?
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Old 01-25-2022, 01:42 AM   #5
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Often the best way, I know of... Should be (basicly) the same.

- Have a fully charged battery.
- Remove all plugs, less restrictions on the starter. If 2p/cyl, pull one plug and confirm the other plug is sealed.
- Pull all plug wires and make sure none touch ground.
- Go to each empty cyl/plug and test. If carb'd, throttle WFO... don't know about FI.
- Document.

The most work, always, is the setup... but it's really simple.

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Old 01-25-2022, 02:05 AM   #6
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Cheers folks.

Can I just pull the centre cable from the distributor to disconnect the spark?

It's only 1 plug per cylinder not like some of the other Z series engines I've heard of.
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Old 01-25-2022, 09:38 AM   #7
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Originally Posted by richURVAN View Post
Can I just pull the centre cable from the distributor to disconnect the spark?

It's only 1 plug per cylinder not like some of the other Z series engines I've heard of.
Why? If it has a good connection... you have to disconnect at the plug anyhow, right? ...with one plug. Na, let a sleeping dog lie, unless a full wire replacement is called for... or other problems arise.

I've never looked it up, never had to... what does the FSM have to say about running a compression check?

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