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  1. #1
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    Tuned 850 T5 - Split liner or HG?

    Morning all, after getting the 850 T5 to where I wanted it last year it has been quietly working away for me for the last 12 months or so without any complaint. It currently rungs a 16T, downpipe, map etc.

    In the last couple of weeks however I have noted that the coolant level has become extremely unstable, when cold it can all but disappear from the tank and when driven hard it fills the tank to the brim, I suggest very close to blowing! Gentle driving does also get some expansion, but only within normal bounds. It's using a small amount but nothing excessive, it seems more like the system is being pressurised based on how hard the car is driven.

    If the system is pressurised to the brim of the tank and I switch the engine off it immediately begins to drain with a gurgling sound and the tank returns to normal levels, this will also happen if I crack the tank cap when the car is hot.

    Last year I replaced the water pump and thermostat as part of a overall service and of course replaced the coolant. I did the coolant again on Friday paying extra attention to bleeding and ensuring the thermostat was opening correctly (which it was).

    I guess at this point I am looking at either a failing HG or even worse a split liner. Can anyone suggest some diagnostic methods to determine this either way?

  2. #2
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    850 2.3 is very unlikely to split a liner, I'd guess HG
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    +1 with Colin

    What about oil in coolant & visa-versa? You don't mention it. I'd not be driving that car until you've figured out what's amis.

    Sniff test will tell you if the HG had gone.

    Also found this thread that may help (or not):

    http://www.vpcuk.org/forums/showthre...il-and-Trouble

    Cheers, Morgan
    Last edited by Shinsplintz 101; Monday 27th March 2017 at 16:02.

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    You won't split a liner with an 81mm block with standard rods, as already said it's most likely the head gasket. Get the head skimmed and also change the coolant cap.

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    Quote Originally Posted by Shinsplintz 101 View Post

    What about oil in coolant & visa-versa? You don't mention it. I'd not be driving that car until you've figured out what's amis.
    No sign of either, both look nice and clean (although as mentioned I did change the coolant a few days ago - but I have done a couple of hundred miles since then.)

    Thanks for the input otherwise gents.

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    Make sure you've got the right coolant in her. Head gasket symptoms can be caused by the wrong coolant. Also as stated already try changing the coolant cap. Before doing the head obviously. Hope it's not the head mate

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    Quote Originally Posted by Mental Wealth Doctor View Post
    Make sure you've got the right coolant in her. Head gasket symptoms can be caused by the wrong coolant. Also as stated already try changing the coolant cap. Before doing the head obviously. Hope it's not the head mate
    Thanks for the comment. I have done some further investigation and found that there is a tiny split in the tank so I'm going to replace that and the cap at the same time. With regard to coolant I wish I could find a definitive answer on what type the car takes, even the Volvo dealer couldn't tell me - I have currently used the blue silicate type from Halfrauds?

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    .... from the Volvo workshop manual....

    LUBRICATION SPECIFICATIONS TABLE
    Application Fluid Specifications
    Coolant ............................. 50/50 Mix Ethylene Glycol
    and Distilled Water
    Brake Fluid ....................... DOT 4 Or DOT 4+ Brake Fluid
    Engine Oil
    Ambient Temperature
    Less Than 68 F (20 C) .................. SAE 5W-30 API SH/CD -4 F To 100 F (-20 To 38 C) .......... SAE 10W-30 API SH/CD Greater Than 14 F (-10 C) ............. SAE 15W-40 API SH/CD
    Power Steering Fluid (1) ............. Dexron-IIE or Mercon ATF
    Automatic Transaxle (AW50-42) ............ Dexron-IIE or Mercon
    Manual Transmission (2) ......... Volvo Synthetic (P/N 1161423)
    Or Type F/G ATF Wheel Bearings .................... NLGI Grade 2 Category GC-LB Steering Linkage (3)(4) ........... NLGI Grade 2 Category GC-LB Ball Joints (3)(5) ................ NLGI Grade 2 Category GC-LB Weatherstrip ....................... Dielectric Silicone Grease
    (1) - At temperatures below -4 F (-20 C) Volvo oil (P/N1161001-1) can be used.
    (2) - DO NOT use Dexron fluid in manual transmissions.
    (3) - Use low pressure grease gun to prevent seal damage.
    (4) - Fill until lubricant squeezes out from the base of seals.
    (5) - Fill ball joint until seal starts to swell.

    ----------------------------------------------------------

    I've no idea what halfords put in their own brand coolant...But it looks ok!?!? Suitable for pre 98 cars. Think the trick is not to put an OAT based coolant in the older cars as it has the potential to eat the internals. Silicate based IATs like the one you've gone for are preferable. Allegedly. Christ, I thought engine oil could be a mine field
    Last edited by Shinsplintz 101; Tuesday 28th March 2017 at 22:32.

  9. #9
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    Quote Originally Posted by Tim Williams View Post
    You won't split a liner with an 81mm block with standard rods, as already said it's most likely the head gasket. Get the head skimmed and also change the coolant cap.
    Quote Originally Posted by Mental Wealth Doctor View Post
    Make sure you've got the right coolant in her. Head gasket symptoms can be caused by the wrong coolant. Also as stated already try changing the coolant cap. Before doing the head obviously. Hope it's not the head mate
    What they both said! If the cap is leaking (ie, not holding pressure) then the system cannot pressurise, so the coolant will just expand with heat and then fill the expansion tank too much and leak out. Then when its cold, it will almost disappear because your losing a slight amount of fluid each time it gets very hot.
    The split tank will cause identical symptoms to a leaking cap, so change them both!!!

    If, after replacing the tank and cap, your still losing fluid and the level rises too much (ie, same symptoms, then it's most likely your HG leaking)

    You will not be able to perform a Cooling system pressure test or Sniffer test properly until you've replaced the split header tank, so change these first.

    Quote Originally Posted by pingpong View Post
    Thanks for the comment. I have done some further investigation and found that there is a tiny split in the tank so I'm going to replace that and the cap at the same time. With regard to coolant I wish I could find a definitive answer on what type the car takes, even the Volvo dealer couldn't tell me - I have currently used the blue silicate type from Halfrauds?
    The Volvo fluid is 'Pentosin' and is a blue colour. i'd advise you use the correct fluid as using incorrect fluid can have a detrimental affect on the engines internals long term and more importanatly, it can affect running temps.

    Just buy it from Volvo! You don't need much and it's not that expensive.

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    Thanks for the comments guys, I will let you know the outcome.

  12. #11
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    http://www.pentosin.net/f_antifreeze.asp

    Pentafrost NF.

    Can't find a UK supplier. But the Volvo branded stuff can be had for 10/L or less so it's probably not worth shopping about.
    Last edited by Shinsplintz 101; Thursday 30th March 2017 at 20:23.


 

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