Uh oh....

retrodriver · Post by **retrodriver** » Sat Jun 20, 2009 5:51 pm

Smoky. I think some exuberant driving (ok, 7.5k rpm) has punished my valve seals.... Every gear shift about 2k rpm, a puff of blue smoke, its ok when driving but going back on the throttle after a bit of overrun or engine braking and its very smoky for a few seconds. Doesnt seem to actually use that much oil but obviously it needs mending.

So whats the best method of fixing it? Or maybe I should just drop a 1.9 in there!

Post by **Tim Leech** » Sat Jun 20, 2009 10:20 pm

7500rpm? sounds like youve fucked it mate.

Post by **Tim Leech** » Sat Jun 20, 2009 10:20 pm

Woopsy.

retrodriver · Post by **retrodriver** » Sat Jun 20, 2009 10:43 pm

the engine actually seems better in terms of power and smoothness after a good hard thrashing but the already questionable valve seals have let go I think, not too much to mend it though I hope!

Post by **docchevron** » Sat Jun 20, 2009 11:10 pm

You fucked it twice!

A good, er, thrash will clear rather alot of carbon and suchlike...
Cylinder head off job though, not too bad to do on a 16 mind..

Might be worth re-ringing the pistons whilst you're at it..

MULLEY · Post by **MULLEY** » Sun Jun 21, 2009 12:07 am

Why on earth would you be reving a car that isnt designed to rev that high in the 1st place???

Mike E (uk) · Post by **Mike E (uk)** » Sun Jun 21, 2009 1:08 am

Do a compression test.
If this is OK, does it give blue smoke when warm at idle?

If it does, it is probably the valve oil seals.

At 105k, I would expect them to be a bit leaky if they have not already been changed.

If you let it warm up 1st, a few high revs are unlikely to damage it-
unless the cambelt lets go.

Mike

kiwi · Post by **kiwi** » Sun Jun 21, 2009 6:29 am

Sounds like the Heads about to let go as well!

Good hard thrashing then the engine seems a bit better on smoothness and performance

You checked the water levels? How often do you put water in it?

7500rpm in a BX16

poor car

sdelasal · Post by **sdelasal** » Sun Jun 21, 2009 9:47 am

Sounds like classic valve stem oil seal problem. At high engine rpm , say 2000rpm, when the throttle closes, i.e. as you shift gear, you get a big vacuum in the intake manifold as that engine carrys on spinning - result is oil is pulled into the inlet ports past the valve stem oil seals. Whe you then tip-in, throttle opens, air/fuel comes back and burns... along with all that oil - hence blue smoke! Steve

retrodriver · Post by **retrodriver** » Sun Jun 21, 2009 12:52 pm

I never have to put water in it and its still full. Lets not forget this engine in Peugeot GTi's can easily rev that high, actually it seemed remarkably smooth, nothing wrong with taking it that high IMO.

The stem seals im 99% sure will be original and as I say its been a bit smoky after overrun since I got it, its just a bit worse now! Compression is the same as it was when I 1st got it, ie a bit lower on 3 than the others. The engine in this one was never perfect and since I joined I mentioned that the engine wouldnt last as long as the rest of the car!

It done 3.5k hard miles with me, often at speed with a lot of weight in it, so its done pretty well. Im thinking 1.9 Peugeot 205 engine, 4 branch manifold and twin webbers lol

TB2 · Post by **TB2** » Sun Jun 21, 2009 2:25 pm

On a related matter, how high is the 1.7 Turbo supposed to rev? I always try not to rev an engine more than necessary, usually riding at low revs. I never go over 3200 unless in 5th gear, in which I avoid going over 3800 for more than a few seconds (when overtaking at high speeds, like 150-160 km/h). The red lines start at about 4200 or so I think...

DavidRutherford · Post by **DavidRutherford** » Sun Jun 21, 2009 2:47 pm

TB2 wrote:On a related matter, how high is the 1.7 Turbo supposed to rev? I always try not to rev an engine more than necessary, usually riding at low revs. I never go over 3200 unless in 5th gear, in which I avoid going over 3800 for more than a few seconds (when overtaking at high speeds, like 150-160 km/h). The red lines start at about 4200 or so I think...

You cannot over-rev a diesel engine unless you drop it into a too-low gear at speed. If you floor the accelerator in 1st or 2nd gear, the engine will go full power until about 4800rpm, at which point it will begin to back off, and by 5000rpm, it will not produce any more power.

Try it. You can't do any damage, and you will possibly blow out a load of soot that has built up due to your gentle driving style. Driving an XUD gently is good for fuel economy, but the occasional "drive it like your pants are on fire" does the engine good.

retrodriver · Post by **retrodriver** » Sun Jun 21, 2009 6:46 pm

Too true, my dad drives our rover 620 diesel like a grandad so when I drive it and boost it up in 2nd I get a huge cloud of soot out the back! The governor on that is about 4900rpm I think and it just wont rev any more so you cant really break it.

A good italian tune up is good for them, and my Punto drives so much better after a good thrashing down the motorway.

TB2 · Post by **TB2** » Sun Jun 21, 2009 6:52 pm

Ah, I'll take that into account next time I got the engine warm

Kitch · Post by **Kitch** » Sun Jun 21, 2009 10:32 pm

retrodriver wrote:I never have to put water in it and its still full. Lets not forget this engine in Peugeot GTi's can easily rev that high, actually it seemed remarkably smooth, nothing wrong with taking it that high IMO.

The stem seals im 99% sure will be original and as I say its been a bit smoky after overrun since I got it, its just a bit worse now! Compression is the same as it was when I 1st got it, ie a bit lower on 3 than the others. The engine in this one was never perfect and since I joined I mentioned that the engine wouldnt last as long as the rest of the car!

It done 3.5k hard miles with me, often at speed with a lot of weight in it, so its done pretty well. Im thinking 1.9 Peugeot 205 engine, 4 branch manifold and twin webbers lol

Which Peugeot GTi? Think you'll find they're all sub-7k limits mate, in standard form. Revving a 16 to 7.5k revs is firstly....pointless, secondly....going to tempt the valves into dancing around all over bonnet and thirdly....embarassing should anyone see you!

Can't see how it'd wreck the valve stem seals though, they're something that detereorate over time. It's probably just sucked aload of shit out of the sump and is now trying to force it through the carb.