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Post by **abscate** » 27 Oct 2022, 17:18

MrAl wrote: 27 Oct 2022, 15:58 Hello again,

I hate to ask this but, does anyone know the number of the torx bit for the relay box top?
I want to check the relay for the fuel pump but not sure what the torx bit number is i may have to order one.

Thanks for any info.

I’ve never sneaked off a T25 screw with a 4mm hex driver, ever

Post by **scot850** » 27 Oct 2022, 19:15

The screws on the lid don't normally come all the way out. Careful if they do you don't drop them down the side of the fuse box!

Volvo use many Torx screws from T8 to around T50? T25 is the most common and used on many things including the fuse cover lid as others have mentioned.

It is worth investing in a set of these either in the form of an Allen key type set or something with a screwdriver type body and magnetic tip to hold a bit. The magnetic part comes in have to reduce the chance of losing screws when removing and re-fitting.

Neil.

Post by **MrAl** » 28 Oct 2022, 01:40

abscate wrote: 27 Oct 2022, 17:18
MrAl wrote: 27 Oct 2022, 15:58 Hello again,

I hate to ask this but, does anyone know the number of the torx bit for the relay box top?
I want to check the relay for the fuel pump but not sure what the torx bit number is i may have to order one.

Thanks for any info.
I’ve never sneaked off a T25 screw with a 4mm hex driver, ever

Oh ok thanks

Post by **MrAl** » 28 Oct 2022, 01:43

scot850 wrote: 27 Oct 2022, 19:15 The screws on the lid don't normally come all the way out. Careful if they do you don't drop them down the side of the fuse box!

Volvo use many Torx screws from T8 to around T50? T25 is the most common and used on many things including the fuse cover lid as others have mentioned.

It is worth investing in a set of these either in the form of an Allen key type set or something with a screwdriver type body and magnetic tip to hold a bit. The magnetic part comes in have to reduce the chance of losing screws when removing and re-fitting.

Neil.

Oh great i think i have that one. I have "T" 8,10,15,20,25 (bits).
Ill see if the T25 i have fits hopefully later today.
Thanks Neil.

Post by **abscate** » 28 Oct 2022, 03:50

You can even use a slotted screwdriver on those fasteners as they are metal into plastic. This is horrible practice but sometimes you have to do what needs to be done.

Post by **volvolugnut** » 28 Oct 2022, 08:44

abscate wrote: 28 Oct 2022, 03:50 You can even use a slotted screwdriver on those fasteners as they are metal into plastic. This is horrible practice but sometimes you have to do what needs to be done.

Yup. this works on small Torx that are not tight.
volvolugnut

Post by **MrAl** » 28 Oct 2022, 10:32

abscate wrote: 28 Oct 2022, 03:50 You can even use a slotted screwdriver on those fasteners as they are metal into plastic. This is horrible practice but sometimes you have to do what needs to be done.

Oh ok i'll have to keep that in mind. I did get it out earlier today though i have it now for examination.

However, another Volvo snag. It's not just a relay, it's a relay plus a complex drive circuit with about 25 small parts on it included resistors and diodes and a transistor and even an IC chip (Motorola) and some caps.
The only guess i have at this point is the two electrolytic caps may be bad. They are notorious for going bad in power supplies so this may be a little different, but a rule of thumb might be 10 years and then look for signs of leaking.
These are not leaking, but they may be more than 10 years old, maybe much more.
The contacts look perfect though, like it was changed out yesterday. No pitting whatsoever. It could be just a good design though where they actually put some thought in to this and used a snubber circuit to damp out the potential 'sparks' from arcing over, which damages the contacts little by little.
The case isnt clear though you have to carefully remove it with two screwdrivers to get it off so you can see what's inside.
I think maybe i should start a new thread on this relay.

Post by **MrAl** » 28 Oct 2022, 10:33

volvolugnut wrote: 28 Oct 2022, 08:44
abscate wrote: 28 Oct 2022, 03:50 You can even use a slotted screwdriver on those fasteners as they are metal into plastic. This is horrible practice but sometimes you have to do what needs to be done.
Yup. this works on small Torx that are not tight.
volvolugnut

Hi,

Yeah got it off i am in the process of examining it to see what i can find out. It's more complicated though it has a circuit in there too with about 25 small parts. That makes it much harder probably need a schematic.