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Exhuast vavle busting same one on 3 rebuilds. 3

Exhaust valve busting same one on 3 rebuilds. 3 different cams. 2 different heads same block

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Checked the connecting rod length and piston wrist-pin location on that cylinder? Before locking the head down put a pancake of modeling clay on the piston and rotate the crankshaft with a wrench to check actual valve clearance. On street engines I do this without the head gasket to add some "insurance". Compare what you see at #3 to one that has not damaged a valve. Also make sure your valve spring isn't going into "bind"...If it is it may be the wrong one (very unusual but I've seen ones get mixed up from different engines) How's the rod bearing on that rod? if it's worn out it can be "throwing" the piston at the valve.
Do what I said and you have to find something!
good luck!

Posted on May 14, 2010

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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

3 Answers

Spark to cylinder but appears to be dead new head does not run right


Was the same fault there before you changed the cylinder head? If so, that would point to piston problems on cylinder No4.

Are you able to do a compression test on the engine? If there's piston/ring trouble on the 4th cylinder that could cause a misfire because of poor compression.

The other thing that springs to mind is that there's something amiss with the valve clearances on cylinder No 4.

I'm not familiar with your car - does it have an overhead camshaft? Unfortunately when refitting an overhead camshaft after a rebuild, some owners have managed to bend a valve. This usually happens because the engine has been turned during disassembly/rebuild and the timing marks have not been aligned when refitting the camshaft.

This results in a valve in contact with a piston and when the camshaft is fitted and torqued down the valve becomes bent.

I think your problem may lie in either a bent valve or incorrect valve clearances.

Apr 18, 2016 | 1993 Geo Storm

2 Answers

How to set camshaft timing


you should have bought a Chilton or Haynes manual. most cars and trucks are all different and have a set way to set them. if you broke the chain or belt and bent a valve. you will need to do expensive repairs pulling the heads to change valves. not sure what car you have or why you pulled the timing off. so I cant be sure what to tell you.

Mar 12, 2015 | Cars & Trucks

1 Answer

Is there ANY other engine that will fit in a 2002 jeep liberty limited? 3.7L v6... need a whole new engine


3.7L EKG Powertec, engine. SOHC with roller followers,
did you check compression, or just P030x codes???????
and what if its just a stuck valve or collapsed lifter
why not ask for help in diagnosis?
compression bad? on one or more? cylinders, post #
pull the Valve covers, see if there are broken valve springs
or bad cam lobes, or lifter bad? (motion)
if it didnt burn oil , try rebuilt heads.?

ran for 12 years, so what is the mileage>? 300k?
Oil changes, at 5000 ?

the 3.7 may fit...says wiki.
warning, some engine blocks may NOT be same. (filter mounts, engine mounts) check first.
but you can find this at any engine builders web site. (google them)
ive swapped many and engine, even wrong engines.?grin
there are always choices, i always have and had spare cars.
so down time is never an issue for me.
but others yes. (rent a car is one option while fixing another)
1: if the block is bad get a short block.
2: if the heads are bad get yours rebuilt , or exchanged.
3: if you blew the engine to total destruction, pistons hit valves? (rare)
then get a used engine, or buy a rebuilt.
or pull yours and take it to any top machine shop and drop it off.
bingo, fixed and cheap too. no middle man, to rip you.

history.
The 3.7 liter PowerTech V-6 engine is, essentially, the 4.7 V-8 with two fewer cylinders.
then later, morphed to the Pentastar V6. (today's motor)
cast iron block, (lasts long time, easy to bore and rebuild)
no rubberband cam belts, real chain, drive.
2 valves per cyl. making head rebuilds fast and cheaper.
forged pistons, not cheap cast.
MOPAR is not POS.
ask engineer Brian Crothers

I run the 3.8L in my 08 JK.
its a real low tech, push rod motor. (ended in 2011)

id fix mine, if it failed
my guess is it is head failure, , so get the newer
rebuilds with pinned, valve guides and run it.




Jan 10, 2014 | 2002 Jeep Liberty

1 Answer

1995 chevy blazer fouling on number 2 cylinder


with this issue , fouling can mean many things, i,ll assume, & i don,t like assuing at all, ? i,ll assume you mean missfiring inderperforming two different issues, two answers, (1) missfiring ,ok change all plugs and remove and overhaul number two injector, replace it,, (2) fouling,? under performing, this can have a few causes i,ll list all, pressure loss in cylinder due to either worn piston rings or valve seatings, or head gasket,?(a) piston rings, luckily this is probably not the problem as usually all 6 cylinders would be effected, (b) valve seatings , hope its not this as it,s a major opperation involving removing the cylinder head an totally reconditoning it, all valves cleaning and reseating, replacing vavle seals , new head gasket ,inlet manifold gaket , exhaust manifold gasket, a good mechanic can get away with changing only the head gasket, but that ain.t you,unfortunatly, so hope its (a) peter.

Sep 01, 2012 | Chevrolet Spark Cars & Trucks

3 Answers

Hoa do i rebuild my motor


You buy a remanufactured short block and have your heads done.

Jul 20, 2009 | 1991 Isuzu Pickup

2 Answers

Rebuilding a 1981 AMC 258 motor - Need modification advice


Depends how much of a power increase you want. For street use I would buy a header, carb and intake, cam, lifters and valve springs, in that order. Upgrade theignition if you can afford it. More (higher numerically) gear in the differential will work wonders! I'd suggest something in the mid 3's. 3.55, etc. Keep the shift point under 6000 rpm. I drag race a 72 Gremlin with a 401, so if you need any more AMC help, let me know.

Jun 06, 2009 | 2006 AMC J10

1 Answer

Rebuild the 305 or go with a 350 engine and the same with trans.


are you going for extra horse or just to have a bigger block. you can do a lot with a small block to give power. change that cam and intake and add a nice 4barrel and some headers and a thrush exhaust and if money is not a problem some new heads . power is in the heds. you can go on line and find vedeos that will show you how to port and polish your heads and you get bigger valves both intake and exhaust been there don this and you can make a bad *** motor

Dec 13, 2008 | 1991 Chevrolet Caprice

1 Answer

White Smoke coming out of bonnet & exhaust,stinks of burning oil


oxygen sensor
oil leak at back of block thats spirting on hot engine block
bad oil rings in block
valves bad
head or head gasket worn and cracked check the oil if chocolate brown then this would be it
a/c preasure line busted or a/c locked up
water line busted on hot engine or small water leak
bad emmission components

these are the things i can think of off the top of my that could give this reaction in vehicle since im not there in person to see vehicle this will have to be what i think

Jun 16, 2008 | 1990 Ford Escort

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