Chris NottVolks Autos
Results 1 to 23 of 23
  1. #1
    tux
    tux's Avatar
    Neutral

    Status
    Offline
    Join Date
    May 2010
    Location
    Notts/Derbys Border
    Posts
    89

    This Looks "Wrong" To Me. What Do You Think?

    So I finally spent some time on the car and got the drivers side head off. Although I can see no obvious point of failure on the head gasket (cylinder 3 was low on compression) it doesn't look right to me.
    It seems that cylinder two may not have been firing? Seems to be almost brand new compared to one and three. Although the head shows an even layer of carbon just like the other two cylinders.
    Also it looks like there is some corrosion going on (in the red circles), is this acceptable, or is the block scrap?

    Thanks for any input guys.

    If it can't be fixed with a hammer, then it must be an electrical problem

  2. # ADS
    ADS
    Join Date
    Always
    Location
    Global
    Posts
    Many
     
  3. #2
    Broken Byzan's Avatar
    Photographic Moderator

    Status
    Offline
    Join Date
    Apr 2004
    Location
    Cardiff, United Kingdom
    Posts
    12,357

    My Social Networking

    Follow Broken Byzan On Twitter Add Broken Byzan on Facebook Add Broken Byzan on Google+ Visit Broken Byzan's Youtube Channel
    hmm the middle one probably has been injesting water causing the steam cleaning effect, and the far right one doesnt look right to me.

    Is that a chunk missing? or shadow/reflection?

  4. #3
    tux
    tux's Avatar
    Neutral

    Status
    Offline
    Join Date
    May 2010
    Location
    Notts/Derbys Border
    Posts
    89
    No, its a small "puddle" from where it filled with water when I took the head off, because I hadn't emptied the cooling system properly.
    If it can't be fixed with a hammer, then it must be an electrical problem

  5. #4
    Broken Byzan's Avatar
    Photographic Moderator

    Status
    Offline
    Join Date
    Apr 2004
    Location
    Cardiff, United Kingdom
    Posts
    12,357

    My Social Networking

    Follow Broken Byzan On Twitter Add Broken Byzan on Facebook Add Broken Byzan on Google+ Visit Broken Byzan's Youtube Channel
    Cool, so which is suffering compression loss dude?

    I would say the middle one has been leaking/sucking water into the cylinder, it's possible that the cylinder that has the compression loss is also leaking into the faulty cylinder....

  6. #5
    6th Gear

    Status
    Offline
    Join Date
    Sep 2009
    Location
    Essex
    Posts
    2,366
    middle one has obviously steam cleaned itself. any chance there is corrosion under the gasket which allowed the water in?

  7. #6
    Tyler Owen's Avatar
    Neutral

    Status
    Offline
    Join Date
    Dec 2008
    Location
    Cirencester
    Posts
    78
    Looks like incomplete combustion in the number 2 cylinder and the unburnt fuel has worked wonders on cleaning the cylinder .

  8. #7
    tux
    tux's Avatar
    Neutral

    Status
    Offline
    Join Date
    May 2010
    Location
    Notts/Derbys Border
    Posts
    89
    Hey, thanks guys.
    I have done a little more investigation now. The gasket is off and there is no sign of corrosion underneath. I have checked the head with a steel rule (not very accurate I know!) and it seems to be flat. The gasket seems to be in very good condition to be fair. Where I circled above it seems it is the gasket that has corroded, so this could have been where water was entering cylinder two.
    The compression test readings suggested that cylinder three was slightly down on compression, but having said that, I did use an el cheapo tester so it probably wasn't that accurate.
    I'm feeling a bit more confident now, so I reckon I'll strip the other side and make sure it is no worse and then clean up and bung it all back together with fresh gaskets/bolts etc. New water pump, thermostat, timing belt kit and serpentine belt and idler should complete the job and hopefully the job will be a good 'un. If not, then I'll probably swap out the lump and be done with it.

    thanks again for your input guys. Its much appreciated.
    If it can't be fixed with a hammer, then it must be an electrical problem

  9. #8
    millsy's Avatar
    Neutral

    Status
    Offline
    Join Date
    Dec 2009
    Posts
    58
    on the right cylinder,is that an oil build up or damp carbon?if its oil,was there any sign of a leak on the gasket?if not,might be an idea to do the rings while its all stripped down?
    you can sleep in your car.........
    but you cant race your house.......

  10. #9
    tux
    tux's Avatar
    Neutral

    Status
    Offline
    Join Date
    May 2010
    Location
    Notts/Derbys Border
    Posts
    89
    Its just damp carbon, where it got filled with water from the head.
    There was no oil being burned and no smoke before the strip down so I think the rings should be OK.
    If it can't be fixed with a hammer, then it must be an electrical problem

  11. #10
    millsy's Avatar
    Neutral

    Status
    Offline
    Join Date
    Dec 2009
    Posts
    58
    thats good news then.
    re; the corrosion on gasket,once all parts are stripped off,flush all the water ways back until they run clear,nothing worse than putting it all back together,only for some crap to be left in there to start the problem all over again!
    you can sleep in your car.........
    but you cant race your house.......

  12. #11
    tux
    tux's Avatar
    Neutral

    Status
    Offline
    Join Date
    May 2010
    Location
    Notts/Derbys Border
    Posts
    89
    Will do. Thanks for the tip, I wouldn't have thought of that.
    If it can't be fixed with a hammer, then it must be an electrical problem

  13. #12
    millsy's Avatar
    Neutral

    Status
    Offline
    Join Date
    Dec 2009
    Posts
    58
    glad to help mate,good luck with other head!
    you can sleep in your car.........
    but you cant race your house.......

  14. #13
    tux
    tux's Avatar
    Neutral

    Status
    Offline
    Join Date
    May 2010
    Location
    Notts/Derbys Border
    Posts
    89
    Alrighty then! Not had a heap of time to work on this over the last month, I'll spare you the excuses, but today I got it finished. Yippee.
    Heads on, belts/tensioners etc changed, front panel back on (broke two, torx 45 sockets doing that which miffed me a bit!) and radiator filled. Heater matrix pipe opened until water came out of the little hole. Turned the key and it started first click. Result! Ran a bit rough for a few seconds and then settled into a nice idle. Waited for it to reach operating temp and ....... its just the sodding same! Not getting even remotely warm air through the demisters either.
    I'm really at a loss now as to what could be wrong. Can anyone suggest anything? I will concede that I didn't change the thermostat (oversight on my part) but as the top rad hose is getting hot I'm tempted to say that the thermostat is opening.
    All ideas greatfully recieved.
    Thanks guys and gals.
    If it can't be fixed with a hammer, then it must be an electrical problem

  15. #14
    jcb
    6th Gear

    Status
    Offline
    Join Date
    Sep 2005
    Location
    uk
    Posts
    4,070
    pull the pipes on your heater matrix and reverse them, you may need to extend them with a bodge. looking at your water galleys I would say it is blocked.

    doing that is a quick way to dislodge any buildup. the down side is it is still in the system. alternative is pulling the matrix pipes and flushing them out with a hose before re-attaching the pipes

  16. #15
    "Stick a V8 in it!"

    Status
    Online
    Join Date
    Jan 2008
    Location
    Glenrothes, Fife, Scotland
    Posts
    14,912
    What exactly is the doing when you say its exactly the same?

    On the 1.8T, the stat is in the bottom hose, so its perfectly possible for the top hose to get hot, but the stat never open and the engine overheat... V6 may well be the same.

    In the above pic, you've highlighted deposits in the water galleries of the block, did you clear all these out, or leave them blocked up like in the pic?

    2000 A4 1.8T Sport Quattro Avant, Berry Pearl
    2000 A4 1.8T Sport Quattro Saloon, Black-ish
    1997 S4 - PPC £999 Challenge Track Car Build
    TD5 Land Rover Defender build


  17. #16
    tux
    tux's Avatar
    Neutral

    Status
    Offline
    Join Date
    May 2010
    Location
    Notts/Derbys Border
    Posts
    89
    Apologies guys, I thought I had explained my woe in the first post, but it seems not!

    There has never been hot air coming from the demisters, the car would "use" the water in the expansion tank in about 25 miles and I have never been able to bleed the cooling system properly. There was a head gasket failure (car was blowing steam from the exhaust, confirmed by a sniff test) so I took off the heads and replaced the gaskets. I got a mechanic friend (who unfortunately lives in Birmingham so isn't around much) to check the heads and he was happy that they weren't warped.
    The water galleries were all clear when the heads went back on. As yet there doesn't seem to be any steam from the exhaust, but I still cannot bleed it up properly and I still don't have warm air.
    In fairness it does feel as though there is no water in the top hose when squeezed.
    I have just ordered a new thermostat and I will change it out. Only missed it due to a delivery cock up from my parts supplier. At least its only the front of engine stuff that has to come off to do it, not the heads again.

    Thanks for your suggestions so far guys, its much appreciated.
    If it can't be fixed with a hammer, then it must be an electrical problem

  18. #17
    "Stick a V8 in it!"

    Status
    Online
    Join Date
    Jan 2008
    Location
    Glenrothes, Fife, Scotland
    Posts
    14,912
    Does your car have climate control? If so, it could be a broken vent flap motor?

    Do the heater matrix pipes get hot, and what does the temperature guage do?

    2000 A4 1.8T Sport Quattro Avant, Berry Pearl
    2000 A4 1.8T Sport Quattro Saloon, Black-ish
    1997 S4 - PPC £999 Challenge Track Car Build
    TD5 Land Rover Defender build


  19. #18
    Neutral

    Status
    Offline
    Join Date
    Dec 2009
    Location
    hereford city
    Posts
    62
    have you opened the allen bolt bleed screw on front of engine my had loads of air in it, right hand side when looking from front of engine under coils only a thought!

  20. #19
    tux
    tux's Avatar
    Neutral

    Status
    Offline
    Join Date
    May 2010
    Location
    Notts/Derbys Border
    Posts
    89
    Quote Originally Posted by aragorn View Post
    Does your car have climate control? If so, it could be a broken vent flap motor?

    Do the heater matrix pipes get hot, and what does the temperature guage do?
    No climate control (not even air-con, I'm poor dontcha know! lol). Heater matrix pipes get hot (still cool enough to touch though) but again they don't seem to be "full" of water. Temp gauge stays steady at 90 degrees as always. Having said that I haven't yet run it for more than about 15 or 20 minutes at a time.
    If I leave the cap off the expansion tank, every so often it spews out water, almost as if it is boiling up.



    Quote Originally Posted by Audidave View Post
    have you opened the allen bolt bleed screw on front of engine my had loads of air in it, right hand side when looking from front of engine under coils only a thought!
    there is a bleed screw on the front of the engine? Tell me more! I was only aware of the bleed hole on the heater matrix pipe.
    If it can't be fixed with a hammer, then it must be an electrical problem

  21. #20
    Neutral

    Status
    Offline
    Join Date
    Dec 2009
    Location
    hereford city
    Posts
    62
    there is a allen headed bleed screw on a steel pipe just to side and below coil pack on the 2.8 30v down by power steering pump pully under plastic engine cover may be the same on 2.4
    http://etka.auto2.ru/epc/cat/vw/BO/2005/403/

  22. #21
    "Stick a V8 in it!"

    Status
    Online
    Join Date
    Jan 2008
    Location
    Glenrothes, Fife, Scotland
    Posts
    14,912
    Boiling over when the cap isnt fitted is completely normal.

    The coolant will get to over 100c before the fans kick in to try to bring it down again, so if the system isnt pressurised then it will boil.

    Sounds like your onto something with the bleed screw though!

    2000 A4 1.8T Sport Quattro Avant, Berry Pearl
    2000 A4 1.8T Sport Quattro Saloon, Black-ish
    1997 S4 - PPC £999 Challenge Track Car Build
    TD5 Land Rover Defender build


  23. #22
    millsy's Avatar
    Neutral

    Status
    Offline
    Join Date
    Dec 2009
    Posts
    58
    you have an air lock mate.wait till its cool and top up header tank,undo 3 retaing screws and support tank as high as possible with out kinking hoses.as already mentioned,remove allen key headed bolt(just to the right of coil pack) and wait till water runs clear of trapped air,replace bolt,tank and top up coolant.start the car,fully turn on heater to hot and to the windscreen.time for a cuppa while it warms up.would recomend not fully tightening cap down for a day or two,which will allow exit for any air still trapped
    you can sleep in your car.........
    but you cant race your house.......

  24. #23
    tux
    tux's Avatar
    Neutral

    Status
    Offline
    Join Date
    May 2010
    Location
    Notts/Derbys Border
    Posts
    89
    Well, its been a while. Been busy with, err, stuff.

    Anyhoo. It seems I was being a bit of a muppet . Had a look at the Audi again this weekend now that I have a little free time and it seems I didn't replace the hose clip after I pulled the hose to the heater matrix back to bleed the system. This was water tight when the engine was off, but as the car got up to operating temp with a little pressure in the system it was allowing water to escape. Clip back on and the problem is solved. Steam from the exhaust was just residual water/condensation from the original blown headgasket problem so all is now good.

    Chucked it in for an MOT this morning as it expired while it was having "issues" and it flew through without so much as an advisory. Result.

    Anyway, despite the fact that I shouldn't be let loose with the spanners I got there in the end. So thanks everyone for your help and input. Have a virtual beer on me.

    On a side note, 10 minutes after getting back from MOT (via the petrol station) at lunchtime, 'er indoors swiped the keys and hasn't been seen since! Bloody typical!
    If it can't be fixed with a hammer, then it must be an electrical problem

 

 

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Single Sign On provided by vBSSO

Garage Plus, Vendor Tools vBulletin Plugins by Drive Thru Online, Inc.

Content Relevant URLs by vBSEO