Page 1 of 2 12 LastLast
Results 1 to 10 of 12

Thread: Conversion coolant issue

  1. #1
    Join Date
    May 2009
    Posts
    21
    Total Downloaded
    0

    Conversion coolant issue

    Hello,
    I am currently converting my 300tdi Defender to ex perentie 4bd1t and am having trouble with my cooling system. I have kept the 300tdi header tank and cut the bottom radiator hose and teed the large hose from tank into it and obviously the small hose from tank too top of rad. As it sits now the top of my thermo housing is exactly the same height as top of header tank.
    The air lock in thermo I can get rid of each time through the fitting on thermo block but comes back everytime I shut down. All hoses are hot except the bottom half of the bottom rad hose which is cool to touch between rad and tee. Fluid in header tank is also cool to touch. Both the water pump and thermostat are new, thermostat opens in boiled water.
    Will I need to convert tank to a recovery system as I'm thinking as both header tank and thermo housing are the same height this is causing air to get into system. Also on a 20min drive at 90kmh temps on vdo mechanical gauge never got above 75deg, only after turning engine off did gauge go just above 80deg.
    Any help appreciated, cheers, paul
    Attached Images Attached Images

  2. #2
    rijidij's Avatar
    rijidij is offline ChatterBox Silver Subscriber
    Join Date
    Jan 2007
    Location
    SW of Geelong
    Posts
    2,383
    Total Downloaded
    0
    Was your 20 min drive in cool conditions, 75deg sounds pretty normal, even though the thermos are 82deg the Isuzus take a bit of work to get hot.
    '88 County Isuzu 4Bd1 Turbo Intercooled, '96 Defender 130 CC VNT
    '85 Isuzu 120 Trayback, '72 SIIA SWB Diesel Soft Top
    '56 SI Ute Cab


  3. #3
    Join Date
    May 2009
    Posts
    21
    Total Downloaded
    0
    Ye a pretty cool day in Perth today. I have noticed the fan sucks a huge amount of air back through radiator so I have a viscous fan set up ordered to put on later. I'm a bit hesitant to drive much further and pushtemps up until I can sought header tank/air lock issue out.

  4. #4
    Join Date
    Feb 2013
    Location
    Sunshine Coast
    Posts
    790
    Total Downloaded
    0
    My setup is exactly the same as yours except the tank must be higher? I fill the system via the tank with the thermo housing plug out then replace it when it starts to spill out and it works perfectly.

  5. #5
    Join Date
    Feb 2014
    Location
    Sydney
    Posts
    1,073
    Total Downloaded
    0
    I had a similar issue with my County with 4bd1t
    I was using the plastic (Disco1?) header tank with the one large and one small pipes. Kept getting air locks.
    I changed the tank to the copper single small pipe tank from a Perentie plumbed to the top of the radiator in the same way as the Perentie. Problem solved.
    Sits on 82-85 deg all day now once it has warmed up.
    Also I found that the header tank needs to be as high as you can get it so that the half way water level is higher than the heater inlet pipes.
    Phil B

    Custodian of:
    1974 S3 swb wagon (sold)
    1978 S3 swb canvas
    48 749 '88 4x4 Perentie
    1985 County with 4BD1T

  6. #6
    Join Date
    Sep 2008
    Location
    Geelong, VIC
    Posts
    4,442
    Total Downloaded
    0
    My setup uses the 300tdi header tank, with the bottom outlet connected to the thermostat housing. No tee in the bottom hose.
    Small hose from the header tank connects to the top of the radiator.
    Its done some pretty hot/heavy work and never had an issue with cooling.
    I'll grab a photo the next time I'm out in the shed.

    Steve
    1985 County - Isuzu 4bd1 with HX30W turbo, LT95, 255/85-16 KM2's
    1988 120 with rust and potential
    1999 300tdi 130 single cab - "stock as bro"
    2003 D2a Td5 - the boss's daily drive

  7. #7
    Join Date
    May 2009
    Posts
    21
    Total Downloaded
    0
    Cheers guys,
    I took it out for over an hour today, same thing couldn't get it over the 80deg mark. All hoses except heater hoses cool to touch. I think I'll give Steve's suggestion a go, if no luck I'll try and chase down a perentie single hose tank.
    Good news is egt's didn't go above 350 so plenty of room to play with when coolant sorted.

  8. #8
    Join Date
    Sep 2008
    Location
    Geelong, VIC
    Posts
    4,442
    Total Downloaded
    0
    Photo as promised



    It's not a perfect setup, but has worked well for the last 7 years, 100K.

    Steve
    1985 County - Isuzu 4bd1 with HX30W turbo, LT95, 255/85-16 KM2's
    1988 120 with rust and potential
    1999 300tdi 130 single cab - "stock as bro"
    2003 D2a Td5 - the boss's daily drive

  9. #9
    Join Date
    May 2009
    Posts
    21
    Total Downloaded
    0
    Thanks Steve,
    I bought barbed fittings this morning, so just have to wait for new bottom house to arrive and I'll give it a try. Does this set up allow you to run tank at half full to allow room for water expansion? My tank is virtually full to get coolant at top of thermo housing, which leaves no room for coolant expansion. Maybe only 10-15mm available to lift tank before it hits bonnet.
    Cheers

  10. #10
    Join Date
    Jan 1970
    Location
    Brisbane, Queensland
    Posts
    5,779
    Total Downloaded
    0
    Skids, can I get the part numbers for a viscous fan set up? Thanks
    L322 tdv8 poverty pack - wow
    Perentie 110 wagon ARN 49-107 (probably selling) turbo, p/steer, RFSV front axle/trutrack, HF, gullwing windows, double jerrys etc.
    Perentie 110 wagon ARN 48-699 another project
    Track Trailer ARN 200-117
    REMLR # 137

Page 1 of 2 12 LastLast

Tags for this Thread

Bookmarks

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Search AULRO.com ONLY!
Search All the Web!