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[E39] Buying tips for the e39 525tds please

8.3K views 5 replies 2 participants last post by  stefan2m  
#1 ·
Hello, tomorrow I'm going to see a '98 525tds touring (manual), and though I know most things to look at when buying a petrol powered BMW, I have nothing on the m51 tu.
Well, other than the fuel pump being prone to fail, and I guess they have a water pump with plastic impeller and problems with the radiator like petrol cars.
I've read the m51 is more silent than the m57, but I've also heard the opposite; same for reliability, and everyone agrees on the fact that an m57 is more frugal and powerful (unfortunately, m57-equipped e39's do not fit within budget anytime soon, there is quite the price difference over here in the Netherlands).
As with all dual mass flywheels, they're going to go out at some point in time so I'll be on the lookout for rattles, and as with all turbo equipped cars, I'll be listening for a whining turbo or whooshing sounds indicating there is a charge air leak.
I've had the opportunity to drive a 530dA touring for about six months so I'm not completely lacking knowledge about a diesel powered e39.

So, I'm looking for tips mainly about the engine as most other things are, as far as I know, no different from petrol-powered e39's.
 
Discussion starter · #3 ·
The one I'm looking at tomorrow looks pretty clean in the pictures, but it also already has 249k miles on it... I know BMW engines can take a lot of miles, and a replacement is easy to find and cheap to buy (plus I can do everything myself if the engine needs replacement).
Having owned an e36, I know exactly what you're talking about... and quite the crunchy one it turned out.
I've been looking at another tds, a saloon, it was rusty but just on bolt-on parts as the bonnet, front fenders, trunk; nothing on the body itself; is this what I can expect from a car that has not been in an accident, or do the bodies themselves rot too?
About the mileage, that is about 1 liter of diesel every 12.3 kilometers, was yours a manual or auto?
And the injector with the trace wire, is that thing known as the main injector? Seen that flying around in a topic before (but I believe it was about the non-tu from the e34).
And not too fast, I know; at least it's not slow like the four cylinders of the time, or unreliable like the VAG 2.5 tdi (sorry, that one IS pretty reliable... you know it's living on borrowed time driving one).
I'll look into the hot start problem, and plan to change fluids as soon as I can anyway (I do not trust previous owners, unless they are enthusiasts like me) so perfect time to change out the pump.
Suspension wise... I changed all front suspension parts on the e36, the previous owner had front and rears done on my e34, and the e32 had everything in the rear done. I know what to expect there :)

EDIT: about the leaking injector, is that about the no. 4 that just develops a leak and needs to be replaced?
EDIT 2: when people mention a broken fuel pump, are they (commonly) referring to the hot start issue? If so, this would be great, as I like the timed relay type fix.
 
Discussion starter · #4 ·
I bought the car I was going to see today, it was a steal money-wise, let's hope my technical knowledge of cars aided by what I've read here made me have a good buy in stead of a disaster.
It's a 1998 525tds touring, other than it being a black line, I don't think it has much options ticked, as it's already a well equipped car in standard form.
Lots of miles, 249k, but no problems with the clutch, driveline or engine; it just clunks a little when I step on the gas and when I release it, can not remember if that's the drive shaft bearing or the rubber disc, but it's usually a cheap and easy fix.
I started the engine cold after opening the bonnet, had my head over the engine for a minute to sniff but no diesel; starter motor is a bit sticky, so might need cleaning or refurbishing.
Cloth interior with a worn drivers seat, but I'll try to source a nice leather interior... tail lights need polishing and fronts are not knock-offs but Hella's; me likey.
There is one thing though, the sls is 'inactive', but the rear is not on the ground, not extremely loose or stiff nor is the drive horrible; I was told there were two new bags in the rear so I'll have to check that; I guess it's a dead sensor or the fault just needs to be deleted after said repair, and to be honest, I think I will get a fresh set of shock absorbers.
Also has some rust blisters here and there, but it's a very decent car for it's age and mileage, and especially for what I paid.

So, those are the bad parts... seems like a bit of a list, but overall I love the car, I don't think I did too bad for what my budget allowed!
 
Discussion starter · #6 ·
The engine has no power till 2000-2500rpm, after that it slowly builds to about 3750-4000rpm and then the car takes off.
I am guessing that's a clogged, sticky egr valve, going to coean it outand make a blanking plate and see if that will fix it.
Maybe I will source an inlet manifold and clean that out too.
Anything other I could check, vacuum lines somewhere maybe?
And... should my car have a cat/sooth filter? If so, that will be bypassed as well.
Anything else I could upgrade in addition to having it mapped?