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Tdci injectors causing problem?

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Tdci injectors causing problem?

Postby cornishpasty » Thu Apr 05, 2012 8:59 pm

Can any one see a link that a faulty injector could cause a big end bearing to fail?

We had a bearing fail and turn in rod.
Rebuilt with new con rod and bearings and lasted less than 40 miles until tapping came back.
Crank was in good condition and dimensions.
Oil pressure was over 3.5 bar at 2000rpm.
When dropping bearings off again they were well lubricated and all oil ways clear through crank and block so can not find a real reason why it happened.

Clutching at straws.

Have ordered short engine from Ford but wondering about injector problem possibility.
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Re: Tdci injectors causing problem?

Postby cornishpasty » Fri Apr 06, 2012 8:08 pm

Nobody got any comments good or bad?

Would you fit new injector in problem cylinder?
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Re: Tdci injectors causing problem?

Postby motorman116 » Fri Apr 06, 2012 9:59 pm

To be honest, I cant see a faulty injector causing problems with the big end bearings, as they are in the base of the engine below the piston so enclosed away from the injectors..... With your problems it does sound like oil starvation........
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Re: Tdci injectors causing problem?

Postby jay » Sat Apr 07, 2012 10:11 am

why did the bearing fail??lack of oil is common cause just because oil is on the bearing dont mean it had enough pressure there to stop it seizing...or did bearing fail due to wear
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Re: Tdci injectors causing problem?

Postby cornishpasty » Sat Apr 07, 2012 12:23 pm

The bearing appeared hammered and went out widthways in con rod until it spun in rod, rod and bearing replaced.

Oil pressure good (3.5 bar at 2000) and oil ways clear just thinking that the only other common link to cylinder is the injector and it would be an expensive mistake if it happened again.
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Re: Tdci injectors causing problem?

Postby ake » Sat Apr 07, 2012 2:49 pm

Have injectors been tested :?:
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Re: Tdci injectors causing problem?

Postby cornishpasty » Sat Apr 07, 2012 4:08 pm

Injectors not been tested.
Understood not many places can do them correctly.
By your comment are you aware that this could cause a problem?
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Re: Tdci injectors causing problem?

Postby jay » Sat Apr 07, 2012 4:36 pm

if the injectors have leaked while vans been standing its possible they could of leaked enough fuel to make the engine to slighlty hydraulic lock or ts squirting to much fuel in that cylinder
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Re: Tdci injectors causing problem?

Postby ake » Sat Apr 07, 2012 4:45 pm

Piston failure caused by overfuelling injectors is not unheard of on mk7
Did it idle correctly, or hunt up and down?
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Re: Tdci injectors causing problem?

Postby cornishpasty » Sat Apr 07, 2012 5:17 pm

It would definitely hunt up and down to the point of stopping quite often
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Re: Tdci injectors causing problem?

Postby ake » Sat Apr 07, 2012 8:51 pm

Needs a pump and pilot learn on Ids and probably imv and prv replacing as well
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Re: Tdci injectors causing problem?

Postby cornishpasty » Sat Apr 07, 2012 9:23 pm

Could you see a connection with this causing bearing failure on no 2 twice?
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Re: Tdci injectors causing problem?

Postby joblogs » Sat Apr 07, 2012 10:26 pm

If you have spun a bearing on the big end, the crank will be damaged. You should of had it reground or a new crank.
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Re: Tdci injectors causing problem?

Postby ake » Sun Apr 08, 2012 11:25 am

cornishpasty wrote:Could you see a connection with this causing bearing failure on no 2 twice?

It's a possibility
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Re: Tdci injectors causing problem?

Postby cornishpasty » Wed Apr 11, 2012 7:11 pm

Started stripping engine to rebuild onto new Ford short engine.

On removing head there is a definite funny carbon pattern on the top of no 2 the one that failed.
Around the edge of the piston there is no carbon and you have the 4 valves outlined in carbon in the correct positions but in the middle of the piston there is like half covered in carbon and half like washed clean.

Looking more like injector problem now.

Woiuld post picture but looks way to complicated.
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