Head gasket

boginhood · 11-11-2007, 17:17

Hi all. Octavia 110 tdi, lost water a couple of times from the expansion tank

not sure if the presure cap is falty or the head gaskets gone

. The water in the tank has a black somthing on the top, but not oily more of a powdery type of thing. With the cap off if you rev it a bit the water will rise and a few bubbles come up

not sure if its the gasket or trapped air. If you put the cap on the hoses don't pressurise like you would expect if it was the gasket (unless very slight leak).
If you push it on the motorway after a while the temp will rise drop and lose water out of tank only.
Any ideas anyone.
Cheers

georged30 · 11-11-2007, 19:02

replace the presure cap it is the easy and cheap way to start troubleshoting.

martziniuk · 11-11-2007, 19:04

Any white gunk on the oil filler cap?

sicknote · 11-11-2007, 19:50

or the dipstick?

boginhood · 11-11-2007, 20:27

Oil is fine, could the black floaty stuff in the water be from the exhaust gas, like i said its not oil but i suppose it could be carbon deposits, if you run it to temp with cap off after a while when you rev it will rise and come out the tank, with the cap on it will come out the tank if you drive it hard.

If it is the head gasket are they much of a pain to do.

Liverpool-Lad · 11-11-2007, 23:27

When was the waterpump last done? They have a habit of going Pete Tong if not replaced at required intervals.

boginhood · 12-11-2007, 11:00

Have not replaced waterpump but would it not overheat if the pump was faulty? also took it steady today (not above 2500 rpm on motorway & round town) and it has'nt lost any water and the black stuff has gone and the header tank is clean inside

KenONeill · 12-11-2007, 12:21

Sounds a bit like the pressure cap to me (at least as a first stop).

11-11-2007, 17:17	#1
boginhood Briskodian Join Date: Aug 2005 Location: west midlands Posts: 28 Thanks: 1 Thanked 0 Times in 0 Posts	Head gasket Hi all. Octavia 110 tdi, lost water a couple of times from the expansion tank not sure if the presure cap is falty or the head gaskets gone. The water in the tank has a black somthing on the top, but not oily more of a powdery type of thing. With the cap off if you rev it a bit the water will rise and a few bubbles come up not sure if its the gasket or trapped air. If you put the cap on the hoses don't pressurise like you would expect if it was the gasket (unless very slight leak). If you push it on the motorway after a while the temp will rise drop and lose water out of tank only. Any ideas anyone. Cheers

11-11-2007, 19:02	#2
georged30 Briskodian Join Date: Mar 2007 Location: Greece Posts: 27 Thanks: 0 Thanked 5 Times in 4 Posts	Re: Head gasket replace the presure cap it is the easy and cheap way to start troubleshoting.

11-11-2007, 19:04	#3
martziniuk Need more power Join Date: Feb 2007 Location: Driffield, Good old yorkshire Posts: 1,747 Thanks: 37 Thanked 127 Times in 126 Posts	Re: Head gasket Any white gunk on the oil filler cap? __________________ Regards Martin Turbo back blueflame exhaust ,Forge FMDV006 Dump valve, Autobahn88 TIP, CAI ,Remapped, FMIC soon.....

11-11-2007, 19:50	#4
sicknote Briskodian Join Date: Oct 2007 Location: Birmingham Posts: 95 Thanks: 5 Thanked 6 Times in 6 Posts	Re: Head gasket or the dipstick? __________________ Ok I know I'm old, I've just found out that they have discontinued my blood group!

11-11-2007, 20:27	#5
boginhood Briskodian Join Date: Aug 2005 Location: west midlands Posts: 28 Thanks: 1 Thanked 0 Times in 0 Posts	Re: Head gasket Oil is fine, could the black floaty stuff in the water be from the exhaust gas, like i said its not oil but i suppose it could be carbon deposits, if you run it to temp with cap off after a while when you rev it will rise and come out the tank, with the cap on it will come out the tank if you drive it hard. If it is the head gasket are they much of a pain to do.

11-11-2007, 23:27	#6
Liverpool-Lad Briskodian Join Date: Aug 2006 Location: Liverpool Posts: 1,624 Thanks: 12 Thanked 44 Times in 44 Posts	Re: Head gasket When was the waterpump last done? They have a habit of going Pete Tong if not replaced at required intervals. __________________ 2001 Rally Red Octavia vRS...remap complete Whiteline rear ARB, Superpro dogbone bush - 225/45/17 Goodyear Eagle F1 Aysmmetrics and lots of V-Power! Smiles all 'round

12-11-2007, 11:00	#7
boginhood Briskodian Join Date: Aug 2005 Location: west midlands Posts: 28 Thanks: 1 Thanked 0 Times in 0 Posts	Re: Head gasket Have not replaced waterpump but would it not overheat if the pump was faulty? also took it steady today (not above 2500 rpm on motorway & round town) and it has'nt lost any water and the black stuff has gone and the header tank is clean inside

12-11-2007, 12:21	#8
KenONeill Briskodian Join Date: May 2006 Location: Normally somewhere in Scotland! Posts: 10,381 Thanks: 56 Thanked 490 Times in 481 Posts	Re: Head gasket Sounds a bit like the pressure cap to me (at least as a first stop).

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