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tomthemonky Gate Opener
Joined: 30 Nov 2011 Odometer: 38 Location: North Wales
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Posted: Sat May 19, 2012 5:48 pm Post subject: cherokee 2.5vm head
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In the process of replacing the head gasket as it was pressurising the coolant system and i have some questions.
ok so first of how can i tell if the heads have been skimmed before?
is it normal for where the injector hole is to be bent where the piston is hitting the head? all 4 heads are like this.
how much on average does it cost to get all 4 heads pressure tested and maybe skimmed?
the gasket looks ok i.e. there isnt any significant signs of corrosion or damage. it is a one piece gasket, not the 4 separate gaskets (its a p reg, 1997? is this normal?) but no.1 head (at the front of the jeep) exhaust valve has like a yellow, gunky almost like glue substance around it/in it and a slight scratch by the valve. will this be the reason for it pressurising?
phew :/
thanks in advance, probably be more questions to follow
__________________________________ Jeep cherokee 2.5td
VW SPAM gti mk2 |
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minimog Off-Road Guru
Joined: 25 Nov 2004 Odometer: 1700
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Posted: Sat May 19, 2012 6:40 pm Post subject:
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It sounds like a cracked head on number one cylinder
__________________________________ WHAT YOUR ASKED WHEN YOU OWN A MOG
"why have you put a merc star on that"
UNIMOG MOTTO
"IF IT CARNT BE FIXED WITH A BIG HAMMER"
IT MUST BE AN ELECTRICAL FAULT" |
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The Smiths Articulating
Joined: 21 Nov 2007 Odometer: 711 Location: Doncaster
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Posted: Sat May 19, 2012 7:08 pm Post subject:
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gaskets don't normally go - its heads.
Also heads should NOT be skimmed at all - just cleaned up
__________________________________ If you always do what you have always done,
you always get what you've always got. |
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tomthemonky Gate Opener
Joined: 30 Nov 2011 Odometer: 38 Location: North Wales
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Posted: Sat May 19, 2012 9:54 pm Post subject:
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why should they not be skimmed? what is the solution?
__________________________________ Jeep cherokee 2.5td
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The Smiths Articulating
Joined: 21 Nov 2007 Odometer: 711 Location: Doncaster
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Posted: Sat May 19, 2012 10:12 pm Post subject: Re: cherokee 2.5vm head
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tomthemonky wrote: |
is it normal for where the injector hole is to be bent where the piston is hitting the head? all 4 heads are like this.
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sounds like someone may have had heads skimmed, and then fitted wrong thickness gasket..........
surface of heads should only be cleaned - or else you will have continual head problems until new heat treated ones are fitted....
__________________________________ If you always do what you have always done,
you always get what you've always got. |
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nutshot Winch Assistant
Joined: 13 Mar 2007 Odometer: 96 Location: Chesterfield
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Posted: Sun May 20, 2012 9:53 am Post subject:
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tomthemonky wrote: | why should they not be skimmed? what is the solution? |
The heads are coated so your not supposed to skim them . Saying that I had 4 heads skimmed for my old 2.5 against the recommendation of a Vm diesel specialist at Chesterfield and I didn`t have an issue running it for a couple of years and about 15,000 miles . Sold it on after that so don`t know if there has been any issues latter down the line .
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tomthemonky Gate Opener
Joined: 30 Nov 2011 Odometer: 38 Location: North Wales
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Posted: Sun May 20, 2012 7:47 pm Post subject:
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sounds like i need 4 new heads then. how can i tell if there cracked? is it obvious or will pressure testing be the soln?
__________________________________ Jeep cherokee 2.5td
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dxmedia Mud Obsessed
Joined: 10 Dec 2008 Odometer: 2185
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Posted: Sun May 20, 2012 8:08 pm Post subject:
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Behind the valves is where they normally go.
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The Smiths Articulating
Joined: 21 Nov 2007 Odometer: 711 Location: Doncaster
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Posted: Sun May 20, 2012 9:52 pm Post subject:
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If the engine was running then you only need to remove water jacket and look - but a little late for that now.
__________________________________ If you always do what you have always done,
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tomthemonky Gate Opener
Joined: 30 Nov 2011 Odometer: 38 Location: North Wales
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Posted: Sun May 20, 2012 10:11 pm Post subject:
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either way i need 4 new heads as there cracked by the injector hole, if they cant be skimmed
__________________________________ Jeep cherokee 2.5td
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tomthemonky Gate Opener
Joined: 30 Nov 2011 Odometer: 38 Location: North Wales
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Posted: Wed Jun 13, 2012 6:16 pm Post subject:
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this is similar on all 4 heads. is this normal? also how can i tell if it has been skimmed?
thanks[/img]
__________________________________ Jeep cherokee 2.5td
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minimog Off-Road Guru
Joined: 25 Nov 2004 Odometer: 1700
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Posted: Fri Jun 15, 2012 8:13 am Post subject:
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That you have circled is normal due to the injector its cracks from the valve area you need to look for or just get it preasure checked to find out properley
__________________________________ WHAT YOUR ASKED WHEN YOU OWN A MOG
"why have you put a merc star on that"
UNIMOG MOTTO
"IF IT CARNT BE FIXED WITH A BIG HAMMER"
IT MUST BE AN ELECTRICAL FAULT" |
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rustycj Gate Opener
Joined: 31 Aug 2011 Odometer: 8
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Posted: Fri Jun 15, 2012 10:00 am Post subject:
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look in detail at the area between valves, it is more prone for cracking than the circled one
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tomthemonky Gate Opener
Joined: 30 Nov 2011 Odometer: 38 Location: North Wales
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Posted: Sat Oct 06, 2012 8:11 am Post subject:
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update: heads pressure tested finaly, time to reassemble.
can anyone tell me the torque seqance/ values?
I have purchased a gasket kit allong with the head gasket but im unsure where some of the gaskets SPAM i upload a picture could someone help?
cheers
__________________________________ Jeep cherokee 2.5td
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