Best Manual Gearoil For F5M21 Gearbox

Discussion in 'Car Modification' started by WilsonTHarv, Aug 10, 2019.

  1. WilsonTHarv

    WilsonTHarv New Member

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    Hey there , i got a Wira 1.5 just converted to manual transmission using F5M21 gearbox with clutch pump , im using Castrol MTF 80w90 GL-4 gearoil with it as far as i know from research this gearbox can't use GL-5 oil which will corrode & cause damage to the bronze syncromesh inside .

    The issue I'm having is sometimes when shifting into 2nd gear kinda hard , can feel like 2 step movement when shifting & when shift into 3rd gear sometime can hear & feel a little bit of grinding but it will slot into 3rd just fine , the other time & all other gears was fine .

    Have been checking the clutch to make sure it was disengage all the way when fully depressed .

    Any manual gearoil suit the best for this gearbox ? it will sees alot of high rpm shift .

    Thanks for any advice =)
     
  2. gunnerzz

    gunnerzz 5 Year | Silver

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    Never cross your mind that the gearbox itself could be faulty? After all, its a used gb with unknown condition.

    I would go back to whoever do the job and request for a change...got warranty?
     
  3. vr2turbo

    vr2turbo 5 Year | Silver
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    Hard to engage can be the oil, but grinding noise I am afraid something wrong with the syncromesh...
     
  4. sweelt

    sweelt Well-Known Member

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    my wira shift 2nd gear got notchy feeling during cold shifting. After change gb oil with redline lightweight shockproof. Blue color.
    it improved not cure lah.
     
  5. vr2turbo

    vr2turbo 5 Year | Silver
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    Notchy during cold, change to lightef oil, 75w90 probably can help, if not add lubegard and try. Yours redline already FS gear oil
     
  6. WilsonTHarv

    WilsonTHarv New Member

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    This is a swap between 2 cars , before the swap i have tested the gearbox on a wira se it was fine .

    There is no warranty as this is a swap & installation of the gb is done by myself .

    Yup , may be synchro issue , but i decided to try the cheapest way 1st as the oil im using now is normal Castrol MTF GL4 fluid , im not sure which oil suit the best for the gb so im seeking for advice from sifus-sifus here =)

    Does u experience gear hard to shift into second or 3rd when on high rpm like over 6000 ? im not sure this is the shifter linkage issue or gb issue =?
    Redline Shockproof Lightweight 75w90 suitable for this gb ?as redline there is so many type of gb fluid , some state that its not suitable for synchro gb as its too slippery, so confusing to use which one =?

    Sorry off topic abit eh , anyone here drove a Wira ? i have issue with my fuel gauge goes up on deceleration & goes down on acceleration , when the fuel level is at last quarter when i accelerate hard the needle can goes all the way to E which is quite scary , coudln't accurately estimate the fuel level so i just pump when the needle is at last quarter on level surface which took around 20 to 22 litres of fuel till the nozzle popped , whats the actual capacity of fuel tank in the Wira ya ?

    Thanks for all the advice from sifus-sifus here & sorry for late replies as i was busy with work , seldom online lately . =)
     
  7. vr2turbo

    vr2turbo 5 Year | Silver
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    The fuel gauge most probably the float issue. Refuel at quarter tank also good practice, rather than risk it going empty on you. I have used once on my VR near empty, took a hard corner, all the fuel went to one side, fuel pump could not suck any fuel for a moment. The car jerk slightly, then after the corner the pump manage to suck fuel again. Was warn not to do that often as the pump might get damaged, so nowadays I don't let it go empty.....lol
     
  8. gunnerzz

    gunnerzz 5 Year | Silver

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    Wira is 40l as claimed. Like my BLM when its blinking, i cant even pumped in more that 30l.

    My mother used to own a wira 1.5 auto before and had never encounter such problem. My bro in law previously owned a wira 1.3 manual and the gauge is working in a way its not working...just like yours but the highest it will go up is 1/2 even when the tank is full.

    I exp erratic fuel gauge on a Pajero before and i removed the float, cleaned the float contact point which moves up and down, put it back and so far it no longer dance once below 1/4 mark.
     
  9. WilsonTHarv

    WilsonTHarv New Member

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    Yup , my habits of refueling a car is usually at last quarter , the car i drove rarely have the fuel reserve light lits up ,as this will make sure the fuel pump is submerged under fuel & provide cooling to ensure a longer fuel pump life .

    But i feel the gauge on my Wira ain't right this way & hope to rectify the problem to make sure its working correctly , it happen all the time just when the level is lesser it will become more erratic , like when it have half tank fuel left when i accelerate hard the needle will drop below last quarter ,quite uncomfortable to see it act that way lol
     
  10. WilsonTHarv

    WilsonTHarv New Member

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    Hmm , guess i need to remove the float & examine the condition , as this was my 1st Wira i doesn't know if it suppose to act this way as i'm thought there is no or inadequate baffle inside the fuel tank causing the fuel to slush around when accelerate & decelerate .

    Thanks for your advice bro =)
     

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