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Nordlys

Diesel Engine Knock in Reverse Gear

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I have a 2005 Toyota Fortuner 3.0L diesel intercooler turbo.  

It's 15 years old with over 200,000km so anything can happen to it but it has been well maintained since new and so far devoid of any serious mechanical issues.  Recently it has started to exhibit phenomenon I can only describe as knocking, most of the time while backing in reverse gear.  Pretty noticeable engine vibration like when your car is in high gear at low speed.  I also sometimes feel the engine vibration in idle more pronounced than it used to be, but never so when the car is in motion especially in cruise (except in reverse).  It doesn't always happen when backing, but when it happens it seems to happen only when reversing

I change engine oil every 5,000km, sometimes in shorter span and I only pump premium diesel and put diesel fuel additive every time I change engine oil, or at least last 4 times I changed (last 20,000km).  

What's wrong and how can I fix it?  

Edited by Nordlys

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Check the  drive shaft universals and center bearing. I have had  a similar problem . The  noise was not a knock  but a  clicking sound. At  first I thought  it was  the rear drum brakes . It also only happened in reverse.

Edited by Dumbastheycome
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Yeah, I'd put money on U-joints and centre-bearing.

 

Take it to your favourite car-man to look at, he should soon be able to confirm / deny the diagnosis.

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4 minutes ago, Dumbastheycome said:

Is  the  vehicle a  manual or  auto? There is a lesser chance it is a manual gearbox issue.

AT.  

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14 minutes ago, Phil McCaverty said:

had a family member with exactly the same problem on his Vios. Worn engine mountings.

What was the mileage with the VIOS and what did you do about it?  Did it happen only in reverse?  

Did you change engine mounts?  

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2 hours ago, Nordlys said:

What was the mileage with the VIOS and what did you do about it?  Did it happen only in reverse?  

Did you change engine mounts?  

Yes and yes. High mileage but can't remember exactly.

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15 minutes ago, Phil McCaverty said:

Yes and yes. High mileage but can't remember exactly.

And changing engine mount solved the problem?  How much did it cost you to do it?  Did you do it at Toyota dealer?

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4 minutes ago, Nordlys said:

And changing engine mount solved the problem?  How much did it cost you to do it?  Did you do it at Toyota dealer?

Same issue with my 8 year old CRV (less than 100k on the clock). I thought it was the front wheel chafing on the bodywork, and it only happened reversing with lock out of the garage. Garage changed one engine mount (because preventive maintenance is not a local thing) which resolved the issue. I expect to go back for the other mount in a year or so.

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22 minutes ago, Nordlys said:

And changing engine mount solved the problem?  How much did it cost you to do it?  Did you do it at Toyota dealer?

It wasn't my car, it was a family member's. Thai. take yours to a Toyota dealer. They will give you a diagnosis before doing the job (and a quote).

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4 hours ago, Nordlys said:

What's wrong and how can I fix it?

You don't say manual or auto box.

Wait till it breaks then fix it.

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3 hours ago, Crossy said:

The collective knowledge says "check anything that has rubber", UJ, centre bearing, engine mounts.

 

Also, why on earth are you changing your oil at 5000km? Most diesels here have service intervals of 10,000km.

 

...... and putting premium diesel in a Fortuner AND additive.

 

Oil changes at 10k + regular diesel more than good enough.

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Is there any vibration felt in the ride when on the street....?

If we are talking actual engine knock, don't dismiss a faulty injector....

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