Valve Adjustment

The place to discuss problems and routine maintenance questions and tips that are NOT specifically diesel-related.
Regular Member
Posts: 11
Joined: Mon Dec 10, 2018 10:15 pm
Location: Louisiana
Isuzu vehicle(s): 1990 isuzu pickup 5 speed 2.3

Valve Adjustment

Postby ScottAHaynesJr » Tue Jan 01, 2019 6:53 pm

Wanting to adjust valves on my pickup but dont know the specs or the steps to do it. Any help is greatly appreciated. I can hear the clatter a lot while driving and at idle so I know the need to be adjusted just dont know how to. It's a 1990 2.3

User avatar
Regular Member
Posts: 2983
Joined: Thu Mar 29, 2012 5:20 pm
Location: Everertt, WA
Isuzu vehicle(s): 1983 Diesel LS Long Bed 4x4

Re: Valve Adjustment

Postby Halden » Tue Jan 01, 2019 9:49 pm

I believe it is 0.006 intake and .010 for exhaust. Both cold. I have heard of some people setting the exhaust looser as these engines apparently have an issue burning valves. I am not sure how true that is.

Easiest way to do valves is working with companion cylinders. 1/4 & 2/3. When you see the valves rock (Exhaust is finishing closing and intake is just starting to open) on #4 adjust on #1. Rock 2, adjust 3. Rock 1 adjust 4. Rock 3 adjust 2.

Hope that helps
It's not pronounced "Ih-soo-zoo", it's pronounced "It-screws-you"
83 LS Long Bed Diesel 4x4
82 LUV Short Bed Diesel 5 Speed 2wd
64 Chevy C20 w/ 283 & 4 speed.
05 Sonata with a standard

Regular Member
Posts: 387
Joined: Sun Jul 17, 2011 1:03 pm
Location: N. Central Arkansas 81 LUV 4x4

Re: Valve Adjustment

Postby dorf » Thu Jan 03, 2019 2:49 pm

Look under how to guides...this web site...further how to adjust

Red Truck
Regular Member
Posts: 118
Joined: Wed Sep 18, 2013 7:10 pm
Location: Vader, WA

Re: Valve Adjustment

Postby Red Truck » Fri Jan 04, 2019 12:26 pm

In case you're unsure, the procedure in the 'how to' guide is under the diesel section, but also works on your gasser. The cylinder/valve steps are the same. TDC can be determined, more accurately than the crankshaft pointer, by removing a spark plug and placing a rod in the plug hole, and watch for the rod to hit peak motion...OR you can slap on your handy dial indicator. The engine will be easier to turn by hand with the plugs removed, anyway. I use a 15/16" socket for the crankshaft nut. Your distributor rotor will point to which cylinder is firing.
I don't intend to dampen your enthusiasm, but I believe you need a repair manual (or a mechanically inclined neighbor), if you plan on continuing this sort of maintenance. They hold the torques, settings, and procedures better explained for the home mechanic. I've had good luck with the Haynes pubs, but there are several others out there. (any relation? Hah!)
'87 Isuzu pickup 2.3 gas, 5spd, 4WD

Regular Member
Posts: 1378
Joined: Tue Oct 07, 2008 9:10 pm
Location: N W Arkansas

Re: Valve Adjustment

Postby oldestisuzuist » Fri Jan 04, 2019 2:35 pm

I have the FSM 4ZD1 engine section in PDF format, PM me your email address if you want it. It has all the info you need.
'78 Chevy LUV,1.9,4sp,headers,31's,SAS Dana 30,Dana 20,SOA rear w/Aussie Locker, body ROUGH, bought new 12/4/78. A pre-P'up?
'87 Trooper,2.3,5sp,headers,31's,ball joint flip & spacer,Aussie Locker rear,Superwinch hubs,brush guard w/5.5K winch.