Question about 1991 Toyota 4Runner

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I have a 30lite kzte diesel and had to replace the cylinder head for the second time .The heads tens to crack on the no4 piston

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You need to get a mechanic that knows what he is doing. The head has to be shaved and the head bolts have to be replaced and replace all rocker ball valve assemblies to stop the head failure, you are aso having a over heating problem on that cylinder which could be an injector or a plugged exhaust pipe.

Posted on Nov 24, 2009

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Posted on Jan 02, 2017

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What's your question?does a crack from the cylinder head causes crankcase pressure


very unlikely
a cracked cylinder head normally presents as over heating, valve seat insert noise or poor performance
increase crank case pressure is from worn engine , cracked/ broken ring/s piston failure , cracked piston, scored cylinder bore/s

Jul 21, 2016 | 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

1 Answer

3.1l diesel. What is the correct head gasket?


no year? Jeep? one post, and no year.
is this WG jeep say in europe. ? we dont have WG here.
WG started in Europe in 1999.
on this usa forum or in our country no 3.1 VM diesels
i do have your FSM book.
and here is what it states. (different liners used etc)
"CYLINDER HEAD GASKETS
A one piece steel cylinder head gasket is used for
all five cylinder heads.
Cylinder head gaskets are available in three thicknesses.
Identification holes or notches in the right
front corner of the gasket indicate the thickness of
the gasket (Fig. 65).
CAUTION: Piston protrusion must be measured, to
determine cylinder head gasket thickness, if one or
more cylinder wall liners have been replaced.
NOTE: If cylinder wall liners have not been
removed; the same thickness head gasket removed,
may be used.
MEASURING PISTON PROTRUSION
(1) Use special tool VM.1010 with dial indicator
special tool VM.1013 (Fig. 66).
(2) Bring the piston of cylinder no. 1 exactly to top
dead center.
(3) Zero the dial indicator on the cylinder block
mating surface.
(4) Setup the dial indicator on the piston crown
(above the center of the piston pin) 5mm (1/8 in.)
from the edge of the piston and note the measurement
(Fig. 67).
(5) Repeat the procedure with the rest of the cylinders.
(6) Establish the thickness of the steel gasket for
all four cylinder heads on the basis of the greatest
piston protrusion (Fig. 65)
buy the book,end all guessing?


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Apr 08, 2016 | Jeep Grand Cherokee Cars & Trucks

1 Answer

What's your question?why does water and diesel mix


Well water and diesel don't actually mix they will always separate but if you have a problem with diesel getting into your water supply it is possibly head gasket gone or fine crack in the cylinder head or engine block. Normally you will notice your engine not running as well as it used to or starting may take longer. Before you go to the expense of major work there are products on the market that you can add the water and it circulates and may help seal up small cracks and blown head gasket, worth a try first. Water can also enter the engine via the air intake if you drive through deep water. This normally will result in the engine stopping instantly as the water will enter the bore and the piston is unable to compress water the way it compresses injected diesel.

Feb 18, 2016 | Cars & Trucks

1 Answer

Have 1996 C1500 vortex 4.3 blowed head gaskets ,replaced head gasket but #4 cylinder is misfiring & only has 30psi & 60psi #3 possible burt valve,burnt piston,compression ring damaged or?


the first thing is --did you do anything with the head ( machined flat-checked for cracks)
did you run a thread tap down the stud holes and blow out any oil,water in the holes
did you inspect the valve heads to see for burnt heads
Why did you replace the head gasket to start with
Low pressure between adjacent pistons indicates blown gasket between those cylinders
to do a head job properly, remove the head and check for warps and cracks ( head machined flat) clean out the threads of the studs and blow any thing out of the holes
next check that all the head studs are the same length and insert each stud in the head so that all the studs sit the same distance above the head before tightening down
next tighten down using the correct tightening sequence so that the gasket is evenly compressed
tighten down to the correct tension or degrees of turn as is stated in the specifications
any piston or valve or ring damage would be restricted to the one piston and would not show up in adjacent cylinder

Jan 01, 2016 | Cars & Trucks

1 Answer

Excessive carbon on spark plugs which causes to fail


carbon on sparkplugs are caused by oil in the combustion chamber.

here are some things to do:
1. replace the sparkplug
2. replace your head gasket
3. check if your ignition timing is correct (timing in the distributor, camshaft, and crankshaft)

if these does not solve your problem, try this:
1. have your cylinder head checked for leaks/cracks
2. replace your piston rings

lastly, if all of these dont work, this is the solution (but quite pricey)
1. have your head rebored. reboring the cylinder head means making your combustion chamber wider so cracks/leaks on the wall will be removed.
2. after rebore.. you have 2 options: resleeve or replace piston rings. Resleeve means inserting sleeves in the bored chamber to replace the removed part. replacing pistong rings is also an alternative since your old one will not fit anymore ot the rebored head.

Aug 12, 2011 | 1992 Nissan Sentra 4 Door

1 Answer

I have a 2003 dodge durango 4.7 and it is overheating which i already r&r the thermostat. fixed the problem a lil but not 100%. also check engine light turned on for second time both same code P0308...


yes... overheating can cause issues in your piston/cylinder head. if your cylinder head is made from aluminum and not metal, overheating can cause cracks and bends in your cylinder head. if this cracks occur inside the combustion chamber, then proper compression cannot be attained. you need to rebore then resleeve your combustion chamber and change the pistons to fix this issue. this will also require resurfacing of cylinder head to ensure that it does not create leaks against crankcase.

Aug 05, 2011 | 2003 Dodge Durango

1 Answer

I just bought a second hand BMW325TDS.When the motor is idling a bit rough and there is white smoke from the exhaust. Can this be the diesel pump timing? Can I set the diesel pump timing and how do I set...


Priority Action Part Type Cause 1 Inspect Head Gasket Head Gasket Leaking Coolant into Cylinders. 2 Inspect Engine (DOMESTIC ONLY) Cracked Cylinder Block Leaking Coolant into Cylinders.

Jun 28, 2010 | 1994 BMW 3 Series

1 Answer

Blowing black smoke on acceleration 2.5 exceed turbo intercooler I have a Mitsubishi 2.5 diesel with what sounds to be a similar problem except it happens when you rev the engine suddenly but stops...


1 Inspect Piston Ring Set Worn or broken piston rings. grey_line.gif 2 Inspect Valve Stem Seal Cracked or brittle valve stem seals allowing oil to enter combustion chamber. grey_line.gif 3 Inspect Head Gasket - Performance Head gasket leaking coolant into cylinders grey_line.gif 4 Inspect Fuel Injector Rich injector grey_line.gif 5 Inspect PCV Valve Plugged or damaged pcv valve. grey_line.gif 6 Inspect Engine Worn or scored cylinder block grey_line.gif 7 Inspect Piston Worn or damaged piston. grey_line.gif 8 Inspect Valve Guide Worn valve guides

Nov 26, 2008 | 2001 Mitsubishi Montero Sport 4WD

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