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1990 GEO Storm 1.6 L DOHC timing belt alignment marks

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Posted on Sep 12, 2009

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Ok 1990 geo storm 1,6 litre dohc replaced water pump replaced 3 valves replaced head gaskets replaced timing belt car wont start any ideas?


90 Storm, must be in Canada, 1,6 (the comma tells me this)
the storm is a:
The car is really an Isuzu Impulse minus some of that car's more expensive features.
my guess is you drove the this 4EX1 engine until the cam belt slipped. yes> if yes you bent valves.????????????
so does compression exceed 150psi on all 4 cylinders now?
we use the cylinder leak down test in all DOHC .
if not , back to the drawing board.
if yes, the we check spark next, then try test fuel.
when did the engine last run , last week,month , year,?
who did your valves, a real machine shop or kid down the street.
a read shop pressure tests the head ,and warp checks it and
then makes sure the valves are ready for long service.
are the head bolts at 58 ft/lbs
did you use sealant on the 3 cap caps, per the FSM book.
if not , top end oiling will fail. and cams wrecked.

the 1.6l DOHC has no HLA's
the lash on valves must be checked, and this is corrected with SHIMS.

a pro machine shop does the for you,did they:?
when rebuilding engines, its best to read the factory service manual first. FSM so you know the special steps just for this engine.
ISUZU engine it is.



quote.
1.6L Twin Camshaft Engine
  1. Disconnect the negative battery cable.
  2. Remove the cylinder head or valve cover.
  3. Position the No. 1 cylinder at TDC on its compression stroke.
The notch on the crankshaft pulley should align with the 0 degrees mark on the timing gear case. Make sure the rocker arms on the No. 1 cylinder are loose and the rockers on the No. 4 cylinder are tight. If not, turn the crankshaft one complete revolution and align the marks again.
  1. Using a feeler gauge, measure the clearance between the cam lobe and the selective shim on the intake and exhaust valves on the No. 1 cylinder, then the intake valves on the No. 2 cylinder and the exhaust valves on the No. 3 cylinder. Note readings.
  2. Rotate the crankshaft 360 degrees. Using a feeler gauge, measure the clearance between the cam lobe and the selective shim on the intake and exhaust valves on the No. 4 cylinder, then the intake valves on the No. 3 cylinder and the exhaust valves on the No. 2 cylinder. Note readings.
  3. The valve clearance obtained on the exhaust valves should be between 0.008-0.012 in. (0.20-0.30mm). If not, replace the selective shim by turning the camshaft lobe downward and installing tool J-38413-2 or J-38413-3 (valve lash spring spacer) between the camshaft journal and the cam lobe next to the selective shim. Turn cam lobe upward and remove the selective shim. Install new shim using the selective shim chart.
The rear camshaft bearing caps must be removed to remove the selective shim.
  1. The valve clearance obtained on the intake valves should be between 0.004-0.008 in. (0.10-0.20mm). If not, replace the selective shim by turning the camshaft lobe downward and installing tool J-38413-2 or J-38413-3 between the camshaft journal and the cam lobe next to the selective shim. Turn cam lobe upward and remove the selective shim. Install new shim using the selective shim chart.
  2. When the adjustment is completed, install the cylinder head covers and connect the battery negative cable. Start the engine and check for leaks.
end fsm quote.

see those 2 marks, and crank must be at TDC. mark first.

26196190-t50uqibptsz0ry0el5zdiz1k-1-0.jpg

May 16, 2016 | Geo Cars & Trucks

1 Answer

What is the fuel pump pressure for a 1990 geo storm 2+2


storm what engine? 4xe1 or 4xf1 SOHC or DOHC (twin cam)?
its really an Isuzu Impulse in snack skins (badges)
does test fuel run engine? that is step 2.
if the cam timing belt slips, the DOHC goes boom.
the SOHC engine belt slip,cause no starts, due to huge
compression drop, and fails the test fuel tests.

SOHC, keyon, 30-46PSI
same for both. engines
but as all mPI engines it drop running at idle.
and rises at WOT> (FPR actions most work right running) ask
but its no running
ever do a 60,000 interval tuneup with a new cam belt.
no?

Feb 12, 2015 | 1990 Geo Storm

1 Answer

How to adjust valve lash on a 1990 Geo Storm


its an Isuzu engine.
there are 3 engines.
4XE1, SOHC 1.6L (base)12valves
4XE1, DOHC , 1.6L same as above but now with 16valves.
4XE1, DOHC, 1.8L bends valves if belt snaps...
note the bad idea of ISUZU calling all 3 engine same name.
a horrid idea.
which one? the second was in USA and Canada only.
the second one was offered as the GSI. is yours that?

so I will attempt to guess for you, its the base engine.
(odds of coin toss)
toss #2, USA, SOHC
guess 3: did a new belt and want to do lash next. Cam belt>
No job stated so i guess 3 times.
Just lash.
SOHC 1.6L only (FSM book quote)
Check the valve lash between the rocker arm and valve stem on both the intake and exhaust valves on the number 1 cylinder, the intake valve(s) on the number 2 cylinder and the exhaust valve on the number 3 cylinder. If the valve lash on the intake valves is not 0.006 in. (0.15mm), adjust the valve lash. If the valve lash on the exhaust valve is not 0.010 in. (0.25mm), adjust the valve lash.

1.6L twin cam has shims.
1.8L has HLA , no lash to set.

HLA= Hydraulic Lash adjusters.

I posted this before, search for it. Im only doing 1 engine.

Apr 12, 2014 | 1990 Geo Storm

1 Answer

Geo storm wont start after putting in new battery,altornatior,plugs and wires,and cap and rotor


storms, those are very rare. and Isuzu is very dead here.USA.
which size engine?
wont crank/?
or cranks ok, but wont start.
its old.
1:check compression, yet, over 150PSI (w.o.t)
2: check for spark at all 4 cylinders?
3: try test fuel if spark is good (spray fuel)

watch scotty
http://www.youtube.com/watch?v=064Ilsz8Fzg&NR=1&feature=fvwp

tell us how far you get.......
btw , it really a:
manufactured by Isuzu and sold in the United States by General Motors from 1990 through 1993 as part of GM's Geo line

btw2
1.6L DOHC (Storm) Interference
both DOHC engins are interfernance
if you skip belt changes, the valve bend and bye-bye engine.
BOOM
and a new motor is more that car is worth.

Feb 18, 2014 | 1992 Geo Storm

1 Answer

Cant get timing marks to aline what are the timing marks on a 1.6 daul over head cam engine


very old post , and no year car. stated. 1990 to 1993 range.
TIMING marks?, (CAM OR SPARK?)
ILL GUESS< 92, cam.
here is your answer, (the path to it ,too)
this car (sheep skinned) is a really and ISUZU.
for sure the engine. (with long ago lost support by ISUZU in USA)
Geo IS GM, and they may (?) have parts. but support is very poor there on GEO.s
i'd start here.
http://www.robietherobot.com/storm/geo_storm_links.htm

also , you can buy and old FSM for your car on ebay if patient.
or login to alldata.com and look there.
1.6L DOHC engine.
THIS IS AN INTEFERENCE ENGINE.
I responded because you are one of the only folks posting here
that knows whats under their hood. of the 3 types.
1.6 L SOHC 4XE1 I4
1.6 L DOHC 4XE1 I4
1.8 L DOHC 4XF1 I4

You, engine is a 4xe1 (isuzu sady don't change the engine name with the DOHC up grade , making parts hard to find and books.
Suzuki did the same silly thing too...
as you might guess, the DOHC is timed quite different.
right now im online at alldata.
and you are at step 11. the cam belt
staring at 3 big cam cogs.
here is the drawing. (1 of 2, the 2nd is belt routing)
step 7
Align the crankshaft pulley to TDC
then 11
http://www.fixkick.com/look/24hr/IsuzuDOHC1.JPG

i feel sorry for any ISUZU owner or GEO's of any kind.
sorry so late.

and last
the best place to look first (no FSM)
is here
http://www.scantool.net/software/alldata-diy-1-month-subscription.html

see discount to alldata.

BINGO !

Jan 30, 2014 | Geo Storm Cars & Trucks

1 Answer

Timing marks on 1.6 dual over head cam


the geo storm, 1.6 DOHC
the FSM cover it, so does alldata.com
hint 2, its an Isuzu engine.
its really (makes information easier to find )
Isuzu:
4XE1-UW a DOHC 16-valve engine with 130 hp (97 kW)
he DOHC engine was used in the 1990-1991 Isuzu Impulse XS, in the 1990-1991 Isuzu Stylus XS, in the 1990-1991 Geo Storm GSi, and the M100 Lotus Elan.
all that off the wiki,,
all cars rare here.....

1st google hit
http://www.robietherobot.com/storm/torquespecs.htm

This engine is interference type
so when timed, with a new belt
roll engine by hand, with spark plugs out.? do pistons hit valves.
yes, stop, the cam is timed wrong.
no, do a compression test on #1, if pass, do all 4. 150psi min.w.o.t.
wide open throttle
a better test, is a leak down test. x4. by hand.
these acts of kindness to the engine, saves most engines.

if the leak down fails, the timing is wrong, or the valves are already
bent..
dont use a fleabay china belt, bet a GATES belt. (they last)
setting the tension is very important to a full life .



Jan 30, 2014 | 1990 Geo Storm

1 Answer

Ichanged the head on my 91 geo storm 1.6 dohc and now it won't start


Double check crankshaft timing mark, on your lower timing cover has some timing marks - crankshaft should be on the 0 mark. Camshaft timing marks--intake camshaft mark set at 3 o'clock and exhaust camshaft mark set a 9 o'clock. These timing marks are critical for motor to run and start correctly. These timings marks can move while trying to install the timing belt. After, you confirm or reset timing and belt, you can confirm timing is correct by rotating the crankshaft twice. Your timing marks should be on right on timing marks discussed at the top of the page. If timing marks are off, start over with timing process.

Jul 11, 2012 | 1990 Geo Storm

1 Answer

Timing belt broke


The Storm does NOT have an interference engine. If the belt broke, replace it and be on your way.

Jan 10, 2010 | 1990 Geo Storm

2 Answers

What is the engine size of a '92 geo storm


The Geo Storm is was equipped with a 1.6L 4 cylinder engine,
the GSI Geo Storm had a 1.8L 4 cylinder engine.

Nov 20, 2009 | 1992 Geo Storm

1 Answer

How to set the timeing on 91 geo storm


The timing marks are located near the top of the crankshaft pulley on the plastic timing belt cover. There is a notch in the pulley to mark TDC (Top Dead Center)
Align the notch with the 0 mark on the plastic cover to set your base timing.
Ground the proper circuit on the ALDL connecter located under the dashboard somewhere under the steering wheel. Check the manual for the proper circuit to ground.
With the engine warm and the circuit grounded. Set the proper timing. Un-ground the circuit and you are done.

Dec 13, 2008 | 1991 Geo Storm

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