Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[Matchless]

my worry is that the car was running ok prior to the idler failing. have had the crank turning (by hand) once the belt was fitted, and there was no resistance at any point so i can only assumethe valves are ok. (boy was i lucky)

Rob.

This suggests to me that the belt was fitted when turning by hand.

It also suggests that there is no compression on any cylinder so unless the plugs were out then there must be bent valves on all cylinders.
With the plugs fitted its quite hard to turn over compression by hand.

[Marks DTM Calib]

Thats bad news.....

Turning it by hand with the belt fitted, it spins easily......I think you have bent valves......no compression as a result and the ECU is sat there going....'bloody hell thats spinning fast'!

We need to know the position of the belt etc before it was removed...more than 2 teeth out and its game over.

[TheBoy]

Jaime, you know I am coming, and we can "discuss" the merits of both codes

The lengths some people go to to get free Tech2 work done  

[RobC_NE]

Marks DTM : "((Turning it by hand with the belt fitted, it spins easily......I think you have bent valves......no compression as a result and the ECU is sat there going....'bloody hell thats spinning fast'! ))"


well have seen robinhoods dvd for the cam belt and it didnt seem to be putting up much resistance upon turining the crank with a ratchet.

however i removed all the plugs to see if any were damaged or anything, and found pretty much all the plugs were coated with oil around the white insulator and over the ht ends, is this the cam cover gaskets?

if the valves are fkd then how hard is it to remove the heads and replace them? unless there are only a few valves gone then they will be replaced on there own.

mind can get aother 3.0 for £150 (plus a new timing belt kit (£70) unless i use the one i have just fitted.)

[Admin]

That was my car in the dvd and I can assure you, it certainly had compresssion!

When turning the crank (once the belt is fitted) it should go from little resistance to really strong resistance as you reach tdc, then ease off again.

As Mark/Fin/Pete have said, if you don't feel this, then you are in trouble!

Also as Mark said, did you check the timing before you locked the cams and removed the old belt?

[Marks DTM Calib]

So what was the belt timing like before the old one was removed?

Were any teeth missing from the belt?

Plugs will not be damaegd by the pistons as they are flush with the dish in the heads.

It does sound like you also have leaking cam covers.....

Head removal and replacement is abotu a days job.....and you definately DONT replace bent valves without renewing the valve guides (they crack and can then break away and get eaten by the engine.....)

Its dificult to observe the resistance the compression is applying...........you can feel it, its down to spannering technique as to how easy it is to observe.

[RobC_NE]

Also as Mark said, did you check the timing before you locked the cams and removed the old belt?

yeah i did, they looked about a tooth out when the crank was at TDC ( i believe its 2 or more teeth out and problems occur and one tooth out or slightly off timing just makes it run like a bag of crap.

IIRC the crank marking is on the face of the crank (once the pulley is removed) and that lines up with the notch at the bottom, while the cams sit with ther respective numbers aligned to the cuts in the rear belt cover. this is purely for a rough visual check, as i had to give the timing kit back to my colleague yesterday.

also. if the crank is 180* rotated while the cams are aligned would this make a difference? or is this very unhealthy for any remaining working valves (assuming any are damaged) :-?

PS. oh yeah, there was no damage to the belt apart from a cut about 2cm long paralel to the edge, bang in the middle, due to a rogue bit of the idler.

[Matchless]

If you turned the crank through 180 deg when the belt was off then you will have bent some valves, unless they were already bent??