DIY Valve stem seal job AAAARG

[Adomw]

Hello

I just thought i'd tell you a story

My NJ has a 6g74 24v quad cam 3.5l motor in it - which smokes at idle

So I bought some valve stem seals and a valve spring compressor.

Six hours later in 40deg heat after having removed the throttle body, plenum chamber, radiator, aircon comp. alternator and their mounts, the timing covers, the cam belt and tensioner,the plugs and plug covers, the cam covers and finally one cam....,

I found that you can't change the seals without taking the bloody heads off! there is less that 1mm clearance around the valve springs.

So I put the thing back together and spent ages doing the quad cam timing- what a flaming nightmare - a bit harder than a SOHC 4 cyl motor -

so about 10 hours from bolt number one it was back together but it only ran on 4-5 cyls - so I pulled most of the above stuff off again to check the valve timing again and the plug leads - all good

got me stuffed - so I took it to my pet machanic who reckons the coil packs are buggered!

I told him to reset the ECU by disconnecting the batteries - so we'll see tomorrow

How could the above work upset the coil packs???

Ado ( sore and really tired!)

[Adomw]

Yep the coil packs are cactus

$200 each

Jees

[klrevo]

Yep the coil packs are cactus

$200 each

Jees

yuk

dean

[Alej Altuve]

OOUCH !!!!!!!!!! sorry for that......
You can change the valve stem seals without taking the heads out, you need a special valve spring compressor... you have to go to a specific store to buy that..... its a tool that... I don't how to describe it, you have to ask for spring compressor for muti-valve engines...... I will post a picture of the tool.....its easier.........

[Adomw]

Not the coil packs!!!

The Mechanic is stumped! - what else causes a 3.5DOHC to have a dead cylinder!! or two

Help!

Ado

[-Scott-]

Leads.
Injectors.

A member on the Pajero Club forum had intermittent trouble which was traced to dodgy electrical contacts on the injectors.

Have you checked the ECU for error codes?

Good luck,

Scott

[Adomw]

Yeah, thanks

I saw that one and was all over the injector wiring but I think we've cracked it now

Wiper plate in the crank angle sensor!!

There's a thin plate on the back of the cam belt cog on the crank behind the harmonic balancer which acts as a guide to stop the cam belt riding back too far and a wiper for the crank angle sensor - I buckled it when I put the harmonic balancer back on which pushed the sensor of it's mounts just enough to make the thing play up.

Have to get a newie

So might be running again tomorrow

Ado

[klrevo]

good to hear mate

dean

[its fishi]

Crank angle sensors are the root of all evil!

Bloody things, it's always them, and they make it seem like it's every other part playing up.

Hope you get it sorted.

[Adomw]

Well I'll tell you how mine got broken

When I removed the harmonic balancer the belt cog came off too and as it did the wiper and collar broke off the cog so when i refitted the balancer the wiper and collar were free - any wonder it ran at all

Man my wallet hurts now- I'll have to wait to save up for my 3.15 TC gears

Ado

[Ryno06]

Gday guys. I have got an 89 Pajero and the RAC has informed me that it is a crank angle sensor.
Essentially the motor runs fine then suddenly cuts out and won't restart. After waiting a while and moving things under the bonnet (nothing in particular jsut trying to look like I am doing something) it starts up and runs smooth again until the next time it happens.
Can anyone comment whether they think it is the crank angle sensor?

[-Scott-]

Gday guys. I have got an 89 Pajero and the RAC has informed me that it is a crank angle sensor.
Essentially the motor runs fine then suddenly cuts out and won't restart. After waiting a while and moving things under the bonnet (nothing in particular jsut trying to look like I am doing something) it starts up and runs smooth again until the next time it happens.
Can anyone comment whether they think it is the crank angle sensor?

Can't rule it out. My grandfather had the same problem with his VL Commodore, problem was traced to crank angle sensor.

Good luck,

Scott

[bludnut]

gudday,

a cheap way to do valve springs on the motor, chop a spark plug in half, solder on an air fitting and , in turn, pump each cylinder up with compressed air, making sure its on the compression stroke. just have to stuff around with screw drivers etc, to remove collets and springs, being carefull not to wear a spring or retainer in the eye!!