Question about 2008 Motorhispania MH-7 Naked

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Not starting its started to over het so i fix that but crack a pice on the piston will it need a new one as there is still compression in the head and it wants to start but wont help me plzzzzzzzzzzzzzzzzzzzzzz

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  • craneyboc Jan 03, 2009

    yes the compression is same and it was over heating because the gasget was gone so water was going in to the head

  • nickels428 May 11, 2010

    Is the compression the same as before the problem?  How did you fix the over heating problem?  what caused it to over heat in the first place?  



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Piston weight is critical to how the engine works &runs that peice thats missing helps hold the piston square in the cylnder bore the broken piston needs to be replaced

Posted on Jan 04, 2009


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Blue smoke coming out of the exhaust

start car when engine cold - place some paper in front of exhaust pipe.
If you see dots of oil you have a major engine failure with the lower block of your engine or the rings. This costs a lot of money to fix !
I sent my car to wreckers to be crushed when I had smoke and burning oil smell plus oil when it was cold.

If it is water when engine when engine cold you may have a cracked engine head , cracked head or blown head gasket.
Less expensive to fix but may require head to be re machined if head is warped. If head is cracked then head will need welding.
A cylinder compression test will confirm this type of head problem.

Jan 24, 2016 | 2000 Mazda MPV

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

If my kx 125 has no compression when I try to kick start it but it does have fire what do I need to do

If no compression, then assuming the piston is moving up and down the pressure is either passing back past the piston (could be the rings or a hole in the piston) or escaping through the head (head gasket, spark plug hole, hole in head). First check the piston is in fact moving as it should. If it isn't moving you need to find out why (bottom end problem?). Can't see you getting away without stripping the engine to fix problem.

Aug 13, 2015 | Motorcycles

2 Answers

My bmw e 46 318i has no compression after skimming the head.

Skimming a cylinder head is never advised though its not much related to the compression unless the surface is not totally flat. Please get it checked in the machine shop if that's your doubt.
Normally compression is the problem of piston being worn out or compression ring misaligned/worn out. In either case it would be difficult for you to check it unless you have prior experience of engine o/h. It better take it go the workshop and get it checked point to point.

Jan 02, 2015 | BMW Cars & Trucks

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What to do when there no psi on cyl 4 to get the psi up agan"?"

There are at least three possible reasons for no psi in cyl No 4.
1. Burnt or damaged exhaust valve in that cylinder
FIX Remove head and replace faulty valve
2. Blown head gasket (water mixed with sump oil shows milky on dipstick and steam or water coming out of exhaust tailpipe, radiator water disappears )
FIX Remove head, grind flat and assemble with new gasket.
3. Broken piston rings, or cracked piston or burnt hole in piston.
FIX replace faulty parts.
Squirt some sump oil ( 2 or 3 spoonfuls ) through spark plug hole,
spin motor , and if compression PSI improves then it is rings or piston, if no PSI then it is faulty ex valve !!!

Jun 26, 2014 | 2003 Mitsubishi Lancer

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Did all the things you suggested including new tires! compression test would show valve problemm

compression tests identify problems with---head gaskets --- cracked heads , blocks--- valves not seating correctly---worn rings ---cracked pistons--- and general condition on the engine

Jan 07, 2014 | 1998 Cadillac DeVille

2 Answers

My mazda has no conpussion how can i fix that i

no/loss of compression can be from a few different problems blown piston/piston rings[fix rebuild engine and replace piston parts ]camshaft flattened lobe [replace camshaft]valves burnt/bent carbon build up [remove head and repair/replace valves ] valve springs weak/broken[repair or replace ] head itself cracked [replace ]these are some of the reasons that u can loose compression if ur guy did compression test and determined its the head[valves ] then replace head if car is worth fixing then fix it good luck

May 31, 2010 | 1990 Mazda MX-6

1 Answer

Will not start I have not got a manual so I am not shore of starting instructions

Could be carb adjustment, cracked fuel lines,bad ignition module, carb needs adjusting, bad fuel filter,or a scored piston and cylinder. Dont know what type saw you run but if compression is under 80 on a poulan it needs a new piston,rings and cylinder head. Need more info.

Jan 12, 2010 | Garden

1 Answer

Put new piston, head gasket in but when put back

check and see if your timing was set correct,is fuel getting to carb, did you hook up all electrical correctly,compression ok ?

Nov 21, 2009 | 2002 Aprilia RS 125

1 Answer

It says misfire #6, but we check the compression of that cilinder and didn,t do nothing , no compression at all. what should I do thanks

There's no compression?
-Cracked cylinder head
-Bad piston rings
-Cracked piston

You, my friend, need an engine overhaul.

Mar 06, 2009 | 2003 Ford Focus

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