Torque Cars

Rover 45 - No compression in 1 cylinder

Discussion in '400/45' started by halfordartistry, 23 January 2011.

  1. halfordartistry

    halfordartistry New member

    Messages:
    7
    From:
    england sevenoaks
    Car:
    rover 45
    I have just changed the head gasket on my 2002 Rover 45 1.6 litre engine.

    I now have no compression on cylinder 3, all others are within spec.

    Can anyone advise how to diagnose fault as I understand it could be a number of sources i.e. valves, piston, rings or liners.
     
  2. turbonutter69

    turbonutter69 TC ModFather Moderator

    Messages:
    18,967
    From:
    Alone in the dark.
    Car:
    Insignia SRI.
    Hello and Welcome to Torquecars.:bigsmile:
    Hope you enjoy your time with us.


    Did you have the head skimmed whilst it was off?
     
  3. halfordartistry

    halfordartistry New member

    Messages:
    7
    From:
    england sevenoaks
    Car:
    rover 45
    No but we checked for any distortion with straight edge and feeler gauge. No distortion detected
     
  4. old-git

    old-git Moderator

    Messages:
    9,182
    From:
    Essex
    Car:
    Elan & Robin Hood
    if you have flat topped pistons, pour a little oil down the spark plug hole and redo the test. If the compression rises near to normal, then the rings are the problem (oil will temporarally seal the rings). If there is no improvement, it is likely to be the valve(s) not sealing properly on their seats .

    This is assuming, of course, that the head and block are flat, the head gasket isn't damaged and the flow of air into the cylinder isn't restricted or leaking away before it gets into the cylinder.
     
  5. SLEEPER

    SLEEPER Pro Tuner

    Messages:
    2,782
    As above but a question

    Why did you change the head gasket ? ............

    presumably there was a problem -maybe you have not solved it.

    If you mistook a bent valve , dodgy rings or a cracked head for a head gasket problem it will still be there if all you do is change the gasket

    And if there wasnt a problem before and is now looks like its not been assembled correctly (head bolts not done up right is always a good bet)
     
  6. T9 man

    T9 man TC Pro Founder Moderator

    Messages:
    20,369
    From:
    London, UK
    Car:
    Saab 9-3SS T9
    Greetings and Welcome! ;)
     
  7. halfordartistry

    halfordartistry New member

    Messages:
    7
    From:
    england sevenoaks
    Car:
    rover 45
    Hi all
    Thanks for comments, will try the test on the rings, but thought there would be some compression even if rings worn.
    Sleeper - Head Gasket definitely gone, lots of water in oil and oil in water, masses of steam etc. Gasket blew between pots 1 & 2 by the look of it so did not fully check condition of valves for pot 3. Checked faces of head and block, look ok. Also inspected liners for cracks and condition of piston, appear good. Repacement of gasket seems to have cured the blown gasket problem. The compression problem may have been there before the gasket blew as the engine was a little sluggish but I had a diagnostic test just over a year ago and the garage said it was a misfire in pot 1 due to the head gasket leaking.
     
  8. halfordartistry

    halfordartistry New member

    Messages:
    7
    From:
    england sevenoaks
    Car:
    rover 45
    Hi all
    Thanks for comments, will try the test on the rings, but thought there would be some compression even if rings worn.
    Sleeper - Head Gasket definitely gone, lots of water in oil and oil in water, masses of steam etc. Gasket blew between pots 1 & 2 by the look of it so did not fully check condition of valves for pot 3. Checked faces of head and block, look ok. Also inspected liners for cracks and condition of piston, appear good. Repacement of gasket seems to have cured the blown gasket problem. The compression problem may have been there before the gasket blew as the engine was a little sluggish but I had a diagnostic test just over a year ago and the garage said it was a misfire in pot 1 due to the head gasket leaking.
     
    Last edited: 24 January 2011
  9. stamford

    stamford Pro Tuner

    Messages:
    3,800
    From:
    Hampshire
    Car:
    MG ZS200
    Did you check the liners? Was the head cleaned up at all and if so were the valves lapped in?
     
  10. halfordartistry

    halfordartistry New member

    Messages:
    7
    From:
    england sevenoaks
    Car:
    rover 45
    Hi Stamford

    Spent long time cleaning up head to ensure it was in the best condition possible. Valves were not lapped in as we thought it was just a gasket problem.
     
  11. stamford

    stamford Pro Tuner

    Messages:
    3,800
    From:
    Hampshire
    Car:
    MG ZS200
    Did you check the valves and chamber at all for any damage? Loss of compression is not always a gasket, but in your case it is the typical k-series issue that most would think it would be. Doesn't take much to get a chipped valve seat or valve, maybe a broken spring etc.

    Some forget the liners can move, so could be that.
     
  12. SLEEPER

    SLEEPER Pro Tuner

    Messages:
    2,782
    A lot of heat and steam can cause damage might be warped or cracked head.

    Im not at all up on the weak points of your engine but you dont need a lot of heat to cause damage
     
  13. halfordartistry

    halfordartistry New member

    Messages:
    7
    From:
    england sevenoaks
    Car:
    rover 45
    Hi

    Thanks all for your comments. Two inlet valves were stuck open. Have now replaced them and lapped all valves in. Have replaced all followers as most were sticking.

    Engine now runs fine generally. However on putting the foot down the engine roars (sounds like coming from air intake/filter box) and also struggles on hill climb if traffic slows you down, need to change down more than you think it needs.

    Any advise welcome
     
  14. nova135

    nova135 Full member

    Messages:
    18
    From:
    uk Weymouth
    Car:
    Nova-K16-71Beetle
    Hi,
    Am just about to finish rebuilding my 45. And wondered if you used the MLS type head gasket. included in my gasket pack was a ( recommendation.)

    All MLS type gaskets should be fitted with the latest type oil feed rail.
    ( part no LCN000140L ) failure to adhere to this recommendation may invalidate any Warranty.
    lucky as i had already fitted the rail in my rebuild.

    Terry
     
  15. halfordartistry

    halfordartistry New member

    Messages:
    7
    From:
    england sevenoaks
    Car:
    rover 45
    Hi Terry

    Fitted new MTL gasket in March 2011. Do not recall reading anything regarding new oil feed rail. Had no problems since fitting gasket.
     
  16. nova135

    nova135 Full member

    Messages:
    18
    From:
    uk Weymouth
    Car:
    Nova-K16-71Beetle
    The set that im using is the Lotus Elise/Exige upgraded head & bolt set. Fits all K Series engines except vvc.
    Thought it might be general practice. perhaps not.

    Terry
     
  17. stamford

    stamford Pro Tuner

    Messages:
    3,800
    From:
    Hampshire
    Car:
    MG ZS200
    There is a kit to use for upgrading the original issues and it does include an uprated oil rail and different head bolts as well as the MLS gasket. It was first used and proven on the Freelander before MGR/SAIC used it.
     
  18. nova135

    nova135 Full member

    Messages:
    18
    From:
    uk Weymouth
    Car:
    Nova-K16-71Beetle
    Thats quite, right. In fact i have moved my uprated oil rail from my late 200 set up to this 45 set up. The 200 was realy used to make the adapter plate & the " fly wheel " " part rover and part beetle ", between the vw beetle gear box and the rover engine. Made mostly from some exspensive alloy. The Lotus kit says that the gaskets are made in the uk and the stretch bolts are made in Germany.

    Enough said on here about my project. should realy start my own thread .
     
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