Page 3 of 3 FirstFirst 123
Results 21 to 27 of 27

Thread: Soft Aluminium Alloy

  1. #21
    Join Date
    Jan 1970
    Location
    St Helena,Melbourne
    Posts
    10,545
    As above what Peter said, the place that tested and skimmed my head said 85 was good but 65 at a minimum if the head was rare or money was a major factor.
    98 TDI AUTO SE DISCO - 3" toughdogs, koni's, M8000 and bar, 265 MT's and still adding !
    2003 Dingo offroad camper trailer
    1998 Triumph Daytona T595
    1974 VW Kombi bus
    1958 Holden FC special sedan

  2. #22
    Join Date
    Jan 1970
    Posts
    1,000
    Quote Originally Posted by 67hardtop View Post
    Ive seen a ford 6 cyl when it was cooked, it happened at the door of this servo, reach a temp of 240deg C at the head as it siezed. I was using a laser temp sensor on another car at the time checking a thermostat, which is how i got the reading. No water and less than 1 litre of oil when we drained it to put another motor in it. "I heard the funny knocking noise but i thought it would be ok coz its been making that noise for a couple months" she said. "I serviced it 3 yrs ago it should have been ok"

    YEPSoft Aluminium Alloy

    So engines can get very hot especially alloy headed engines. Coz alloy dissipates the heat quicker than cast iron, it also "attracts" the heat from other components.

    Its actually strange coz the engine block was only around 180deg C at the time but the head was cooking. Oil was smoking and the years of built up crap was fizzling very well...quite funny was the look on her face when we told her that it should be serviced every 6 months and checked weekly...she never lifted the bonnet in the 5yrs she owned it.

    Its looked after well now. She comes in every 2 weeks just to get us to check it.

    This was about 6 months ago

    Cheers Rod

    Thanks ,

    that`s useful because it would be high in the range of meltdowns , i don`t know but would think that someone that watched the gauge and pulled up in the red wouldn`t be as high as your figure .

    I guess i`ll look to see what the range is of the senders and gauges .

    I`ll also have to look into the temperature that LPG freezes in a converter with a hot engine .

    Twice , which were both my fault my wife drove our 3.9 LSE till it wouldn`t run on LPG because the converter froze , it had no effect on the gaskets or heads , though about 5 years later i had to change the gaskets because one had burn between two cylinders like an ark but was nothing to do with soft alloy but this failure is the type i would expect if marking where the fire ring sits . I never looked or even thought about it but it was a not uncommon fail so don`t think so .
    PLR or peter r elsewhere

  3. #23
    Join Date
    Mar 2008
    Location
    --
    Posts
    14,446
    There come times when this phrase applies...

    You're over thinking this.
    5.... 4.... 3.... 2.... 1....

  4. #24
    Join Date
    Jan 1970
    Posts
    1,000
    Quote Originally Posted by Tombie View Post
    There come times when this phrase applies...

    You're over thinking this.

    No problem , i don`t understand how you and 67hardtop or anyone else that clicks would arrive at that conclusion .

    It may seem simple to you both but i think there is a lot more to understand than has been put here .

    If it was clear cut all the information would be layed out easily accessed easily found and understood , there would be nothing to question or search .

    When things are not clear cut that is when , in my opinion there is a need to spend some time with it and i quite enjoy learning things , specially when i had accepted and given little thought to it .

    I agree that things are as simple as you let them be if that`s how you both mean it .
    PLR or peter r elsewhere

  5. #25
    Join Date
    Apr 2014
    Location
    Blair Athol, Adelaide South Aust.
    Posts
    1,533
    Not how im approaching the original question, im just putting forward my own personal experience and knowlege. I know nothing about brinnel tests and all that stuff. My father would have seeing he was a first class machinist and tool maker. I only know about it from what ive learned over 40 yrs as a mechanic. Although i do try not to over think some things, other things such as electronic diagnostics require a lot of thinking at times. However the "hammer" trick was told to my by a very well known engine reconditioner of the time who is now no longer with us mere mortals and it has served me well especially when customers say "here is a second hand head, i got it from a mate, fit it for me". Ive not been wrong yet but i spose there will be a first time.....Soft Aluminium Alloy

    Sometimes a little knowlege can be helpful in the right hands, but a hindrance it other hands.

    IMHO

    Cheers Rod

    I am in no way trying to insult or undermine any one at all.
    Cheers, Rod


    BETSY
    1967 Series 2a. 109 4 cyl petrol, Fairey o/drive, Athol Hedges roof.
    Currently undergoing rebuild.
    Will have-- soft top, 4 wheel disc brakes, salisbury rear diff, military colour, 12 pin nato socket, dual pintle hitch....

    1975 Series 3. 109 6cyl 186, 5 speed Nissan cabstar gearbox, mechanical winch, roo bar, kings awning, 50" light bar, roof rack, twin 6"light bars, kings awning tent.

    1969 NO. 5 trailer. ARN 176 464. soft top.

  6. #26
    Join Date
    Jan 1970
    Posts
    1,000
    Quote Originally Posted by 67hardtop View Post
    Not how im approaching the original question, im just putting forward my own personal experience and knowlege. I know nothing about brinnel tests and all that stuff. My father would have seeing he was a first class machinist and tool maker. I only know about it from what ive learned over 40 yrs as a mechanic. Although i do try not to over think some things, other things such as electronic diagnostics require a lot of thinking at times. However the "hammer" trick was told to my by a very well known engine reconditioner of the time who is now no longer with us mere mortals and it has served me well especially when customers say "here is a second hand head, i got it from a mate, fit it for me". Ive not been wrong yet but i spose there will be a first time.....Soft Aluminium Alloy

    Sometimes a little knowlege can be helpful in the right hands, but a hindrance it other hands.

    IMHO

    Cheers Rod

    I am in no way trying to insult or undermine any one at all.

    G`day Rod ,

    no problem .

    I knew by replying to Tombies remark i was killing the thread . Once general chat gets in it`s finished .

    The thread was going to have too many branches as would be seen there are a lot of individual topics within .

    I was pleased that although not mentioned people understood that portable testers were the ones of interest .

    The initial question about the tester i now have a much better understanding of , there is also an ultrasonic contact tester , it too uses a hole it actually burrows albeit not far into the surface so leaves a mark as well .


    I started my apprenticeship in 1973 working on mostly 2 and 4 stroke motorcycles and trucks and tractors and farm machinery with not as many cars and some series LR , in the country there is much more variety i think and it was expected you would pick up whatever it was you worked on .

    I can`t believe today people charge for a job they can`t do for whatever reason . I have always thought when doing some things what a bastard of a job but there was never a reason other than economical not to repair anything .

    I`m often surprised by questions here where someone has i problem with how to do something , i was taught to work out how to do it and if something needed to be made or modified just do it .

    Recent times , though not anymore , i`ve been killing fish with 500 mtrs of net that had to be retrieved by hand from an 11mtr ally tri hull and working on mostly alloy boats , fitting out repairing , refloating etc , mostly Coxwain length boats , refloats tend to be smaller glass , people that don`t understand weather well . Most end up on the beach and low water with some ply and sikaflex and self tappers and drill with a couple of batteries will have most things water tight pretty much , it`s helpful to have a water pump also incase there`s an unseen leak on the way back but normally a bucket will do .

    The reason i took your hammer thing on board is because whenever i intend to do something that now days requires some form of elaborate machine etc i find out how it was done in days gone by , most thing are only a modification of something that was thought of a very long time ago .

    I agree with your phrase but i won`t wear the cap .

    Cheers
    PLR or peter r elsewhere

  7. #27
    Join Date
    Mar 2007
    Location
    Warwick Qld
    Posts
    489
    Quote Originally Posted by PLR View Post
    No problem , i don`t understand how you and 67hardtop or anyone else that clicks would arrive at that conclusion .

    It may seem simple to you both but i think there is a lot more to understand than has been put here .

    If it was clear cut all the information would be layed out easily accessed easily found and understood , there would be nothing to question or search .

    When things are not clear cut that is when , in my opinion there is a need to spend some time with it and i quite enjoy learning things , specially when i had accepted and given little thought to it .

    I agree that things are as simple as you let them be if that`s how you both mean it .
    Ok, to simplify it a bit.
    Alloy engine components are made by mixing aluminium with other metals, to create a material with certain properties, in the case, the ability to handle a certain level of heat and pressure whilst retaining its rigidity.

    If it gets too hot, the properties change, meaning it may lose some of it's rigidity.

    This is what they are measuring for with the hardness test. If the head is not hard enough, it won't retain its rigidity.

    They do not damage the head by testing it. The test gives an indication of how hard (rigid) the head is. Below a certain level, and it's a lottery whether or not the head will be useful any more

    Soft Aluminium Alloy
    -----
    Light travels faster than sound:
    This is why some people appear bright - until you hear them speak
    -----
    1996 Disco 300 TDi ("Slo-Mo")
    1995 P38A 4.6 HSE ("The Limo")
    1966 No 5 Trailer (ARN 173 075)
    -----

Page 3 of 3 FirstFirst 123

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!