Saturday, 21 August 2010

Rear Brake discs & Pad Replacement.

So the warning light flashed up on the dash that meant it was time for new rear pads at ~85,000 miles. I had previously changed the rear pads at approx 50k miles, with Textar ones from GSF. My discs were looking past their best as well, being the original discs, having lasted 85k miles!

I had thought of getting official BMW drilled discs at £80 a piece from BMminiparts , but when i saw Brembo rear discs at £65 for the pair incl P&P on ebay, I thought I'd save myself some cash. And anyway I've already got front grooved discs so, rear drilled discs would look a little odd. I also again got Textar pads (OEM supplier) this time from Eurocarparts for about £20.

The DIY was going well, got the rear left pad & disc done in about an hour, but the rear right was real PITA!! It took over an hour just to get the disc off, which was rusted on and stuck to the cruddy looking handbrake mechanism behind it (see pic to left). In the end i got it off, but in doing so with some needle nose pliers, the handbrake was a little loose after...... no biggie the car was going in for an Oil Service at Crossflags BMW and they readjusted the handbrake at minimal cost.

Hints & Tips
- If you change discs & pads at the same time, they can squeal a for a little while, as they bed in. Mines did, nothing major, just a slight squeal at very low speeds and so I applied some more copper grease to the relevant areas. That only reduced the squeal slightly, but as the discs & pads bedded in over teh following weeks, the squeal has disappeared completlety.

- One tip i learnt from the 1st time i did the rear pads was not to bother with aftermarket "pad wear sensors" from the likes of GSF/Eurocarparts, because the sockets on them are a terrible fit requiring electrical insulation tape to keep them fitted snugly. Instead I ordered original rear brake pad wear sensors from BMminiparts, cheaper than at the dealers, albeit a little more than the el cheapo's from the likes of GSF.

- A rubber mallet will help get your old wheels off if they've rusted on!

- The gap behind the caliper retaining bolts is fairly tight, and when torqueing those bolts back up a 1/4" torque wrench will slip in behind for BOTH bolts & makes the job much easier. Whereas a 1/2" torque wrench will only be able to access the lower of the 2 retaining bolts.

- Also make sure you have plenty of brake cleaner, nothing worse than getting half way through this job and then running out of the stuff. Make sure you clean off all the dirt and crap off guide bolts, the caliper piston etc A wire/stiff brush is handy.

- I used a drill with a rotary wire wheel brush to clean up the hub faces, before applying copper grease to them. Also did the same to the backs of the alloys/rims themselves.

- Use plenty of copper grease (works just as well as anti squeal paste) on the backs of the pads, pic below is from M3 Madrussians website (with excellent DIY write up), of where to apply the grease to the pads. Below is also my pic of the copper grease used on the hub face also, so that the back of the wheel doesnt rust and get stuck on to the hub, hence comes off more easily the next time you wanna remove your wheels.

Wednesday, 9 June 2010

Replacing crankcase ventilation pipe (CCV)

After having the camshaft sensor replaced in sep 2009, the CCV pipe (no. 2 above) which has to be bent out of the way, started to tear so Crossflags BMW used some tape to hold it together, BUT failed to mention this to me, i only noticed a few months later! Not very professional of them!
It doesnt carry any oil, but is a ventilation pipe, so the worst that will happen is that some oil vapour would be lost and it will idle a little irregular. So i ordered a replacement pipe, the cold cliamte version (11 61 7 533 398) which has foam lagging around it for £20 from Crossflags. Pic below shows old pipe (with tape repair) on top and new lagged pipe below.

In order to replace the pipe the airbox must come out, this is a fairly simple process, with you having to disconnect the MAF. If you are unsure as to how to do this, there's a link to a video by Solid Jake from E46 Fanatics at the end which shows you how this can be done, and also helps familiarise yourself with that area of the engine.

Once the airbox is out above is what things will look like, with the green arrow pointing to the top of the pipe, and the red arrowpointing in the direction of where the lower end of the pipe connects to the oil separator, about another 8 inches in that direction. (Note, not my pic i annotated someone elses)

It looked fairly simple to replace, but it's actually really fiddly getting your hands down to the lower end of that pipe, where it connects to the oil separator (part no 1 above). I actually had to break the tab on the lower end of the pipe with long screw driver by twisting it, which you can see on the left.

Once the old pipe is off you must pass the new pipe down the small gap infront of the intake manifold and behind & to the left of oil filter housing (i removed the oil filter to allow better access). This is a little trickier with the cold climate version as the pipe is fatter cause of the foam lagging. The pic on the right shows what i mean, with the 2 red dots showing where the pipe connects to.

Once I'd passed the pipe down the gap it was the really fiddly & difficult process of connecting the lower end of the pipe on to the oil separator. You can see that some electrical connectors need to be disconnected in order to allow easier access to let you grip the lower end of the pipe properly. The red dot in this pic shows where the pipe must connect to.

If you look at the pic above where i have broken the tab it must be pinched from both sides for it to slide on and for the 2 hooks/tabs to "click" into place. I must admit i only heard 1 click, but that was after trying for a loooooong time! But it can't really move from that position, so I'm pretty sure it will be ok.

Overall this was a real PITA. There is a risk you could break other hoses & pipes coming off the oil separator, so you gotta be gentle. Connecting the lower end of the pipe requires you to pinch and push the pipe on, without inadvertantly applying too much force on to the oil separator & disrupting it & the 3 other pipes that connect on to it. Below is another pic of the old pipe, now with the tape removed so you can see how badly it had torn, close to its upper portion.

Another pic of where the pipe connects on the upper part of the engine:

And lastly a pic with the pipe reinstalled:

DIY Links:
Thanks to Solid Jake whose excellent idle control valve DIY video, shows you how to remove the airbox and more importantly for me, helps in getting you orientated.

The following are helpful DIYs for the oil separator:

Tuesday, 8 June 2010

Bent Steering tie rod

Was driving along at about 40mph at night and didnt spot a massive pot hole, and it was immediatley obvious something was broken in the steering. The car was pulling to the left quite badly, had to keep the steering at the 1'o'clock position.

Got home and had a look and the tie rod was bent :( Didnt get to take any photos but it is part no 4/5 drivers side.

I got hold of the part for about £30 from GSF car parts and had to find someone quickly to fit the part and i decided to go to a local garage that had replaced my clutch the previous year. Total parts & labour came to £85, but they werent able to get the steering quite straight, took it back to them, and then it was pulling in the opposite direction!! Claimed thats just how it was! On top of that they scratched the paint work on the drivers side front wing!! By this point i couldnt be bothered arguing with them, and know not to bother going back.

So i ended up having to go to a BMW dealer Crossflags who did a 4 wheel alignment for £135! So much for quoting me £80 excl vat on the phone! Crossflags in Dumfries are actually pretty good, as far as BMW dealers go, but that aint saying much when my they're up against dealers like Harry Fairbairn!! More on the rip off merchants at Fairbairn another time!

Power Steering fluid change

I originally changed the power steering fluid back in summer 2009, and the fluid came out a very dark red. New power steering fluid, which for my BMW is actually a ATF Dexron III is a transparent red colour. BMW will never renew the fluid at any service and will only top if required. Which is fine for the 1st 100k miles or so, and after that BMW dont' really care if the pump fails, they just get some business to replace it! So if you want the power steering pump and rack to last closer to 200k, then i'd recommend this approx every 15k.

So i decided to change it this weekend again at ~84k, a little OTT as its only been 10-12k since the 1st change. Its not a proper flush, but you can siphon off about 300 mls from the top reservoir, i used a 50ml syringe, and replace what you removed with new fluid, then repalce the cap and turn the steering from lock to lock several times. You then repeat the above process several times, and in effect you are exchanging the fluid for fresher fluid. Of course a drain & flush would be best, but thats a bit of a PITA!

Above ia a pic of some old fluid, and there is still some red colour to it after 12 mths usage, unlike when i did it for the 1st time ever last summer, when it was almost black! I used 1 litre of Castrol ATF TQ Dexron III costing about £6, if its the 1st time you are doing it then perhaps 2 litres would be better.

Heres a link to the DIY i used from Bimmerfest:

Ease of DIY: Piece of cake. If you can fill your car with gas, then you can do this no sweat, and prolong the life of your power steering components by at least 50k.

Monday, 10 May 2010

WTF!! Where's my Idler / Deflection pulley??

Recently I'd been trying to find the cause of a squeal or whistle from the engine area under gentle acceleration between about 1200-2000 rpm. I had my water pump, thermostat and belts changed about 18 mths ago and noticed the squeal start BEFORE that job was done.

I found some great vids over at bimmer forums, a user called BimmersGarage, which are posted on youtube. Whilst watching the vids i noticed that the arrangement of his pulleys and his drawing were not like mine from what I could remember, so i went out and checked, and sure enough it looks as though my idler pulley is missing!! Was my tensioner pulley taking up the slack???

Below is the schematic diagram by Bimmersgarage showing the lay out of the belt, tensioner and pulleys.

In the 1st video, 10 secs in it very clearly identifies the pulleys, and its pretty clear when you look at the pic of my car that there is NO DEFLECTION PULEY (part no 15 here) I've not noticed any significant ill effects from not having this, but what could be the possible ill effects of this??

Well I posted this problem up on E46Fanatics, and after people doing some head scratching and digging, the long & short of it is that not all M54/52 engines had the defelction pulley, if this was the case it appears to have been on Euro cars. Below is a pic I took of the TIS manual which clearly shows that not all had the "Auxillary Tensioner Roller" as BMW calls it.

So in the end i could rest easy that my M54 wasnt missing some vital parts. In fact it might even release a few more bhp...... new mod.........deflection pulley delete!!