Z24 engine best way to disable the fuel for compression test?? - Infamous Nissan

richURVAN · 01-24-2022, 02:51 AM

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

alabama_lowlife · 01-24-2022, 11:15 AM

Disconnect the fuel line from the input of the fuel pump and plug the line.

cadillacdude1975 · 01-24-2022, 01:26 PM

Pull the fuel pump fuse/relay.

IssaNissan · 01-25-2022, 01:29 AM

Quote:

Originally Posted by richURVAN

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?

89'HBV6 · 01-25-2022, 01:42 AM

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.

richURVAN · 01-25-2022, 02:05 AM

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.

89'HBV6 · 01-25-2022, 09:38 AM

Quote:

Originally Posted by richURVAN

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?

01-24-2022, 02:51 AM	#1
richURVAN Join Date: Dec 2021 Location: Melbourne Posts: 13 Vehicle: 1991 Nissan Urvan Cargo SWB Z24 2.4 Petrol 2WD Manual Thanks: 1 Thanked 1 Time in 1 Post	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

01-24-2022, 11:15 AM	#2
alabama_lowlife Owner and Administrator Join Date: Sep 2008 Location: jack, alabama Age: 42 Posts: 10,782 Vehicle: 2012 370Z, 1970 Datsun 521, 1995 Nissan Hardbody x2 Thanks: 1,088 Thanked 2,227 Times in 1,828 Posts	Disconnect the fuel line from the input of the fuel pump and plug the line. __________________

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01-24-2022, 01:26 PM	#3
cadillacdude1975 The Gear Jammer Join Date: Apr 2013 Location: Chattanooga, TN Age: 50 Posts: 10,681 Vehicle: 87 VG33 Pathfinder SE 4x4 & 87 D21 SE Thanks: 457 Thanked 1,400 Times in 1,265 Posts	Pull the fuel pump fuse/relay.

01-25-2022, 02:05 AM	#6
richURVAN Join Date: Dec 2021 Location: Melbourne Posts: 13 Vehicle: 1991 Nissan Urvan Cargo SWB Z24 2.4 Petrol 2WD Manual Thanks: 1 Thanked 1 Time in 1 Post	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.