sudden loud tapping

Submitted: Monday, Jul 25, 2011 at 16:00
ThreadID: 87780 Views:11905 Replies:12 FollowUps:4
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Hi all
About 10km south of Larrimah on our way to Elliott, the trusty HiLux went from an intoxicating purr to a sudden loud BRRRRRR, almost like a 2-stroke. There's a loud tapping from around the head and a waffle coming from the snorkel inlet.

We had no choice but to limp it to Katherine where we finally managed to make an appointment with a mechanic tomorrow. We are now a family of 4 in a van park with the possibility of a hefty bill, with a daft dog.

I'm not burnig oil or extra fuel that I have noticed, she's not running hot or losing coolant. She's noisy and seems to have reduced power. I have heard that it may be lifters, valves or perhaps a timing belt that has skipped a tooth. It starts fine, it's just really noisy! It's not skipping or misfiring. Oil was changed 1000km ago with its usual penrite, filter too. It has a new snorkel and tappets were done about 4 months ago. Any ideas?!

Thanks guys.

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Reply By: Member - DAZA (QLD) - Monday, Jul 25, 2011 at 16:37

Monday, Jul 25, 2011 at 16:37
Can you describe what year or model it is.
Is it a Common Rail ect.
The information might help forum members or visitors give you answers.

AnswerID: 460891

Reply By: mrcv8 - Monday, Jul 25, 2011 at 16:59

Monday, Jul 25, 2011 at 16:59
You will probably find out soon anyway, but one of our work's hilux's started making a very similar sound recently and it turned out to be one the injectors. We are currently fighting with the extended warranty trying to get it replaced under warrantly as they wanted > $2k to fix it. (06 with 110k)

I first thought it was an exhaust manifold or header leak but it is definately one or more of the injectors when you look closer.

Toyota tried all sorts of excuses to get out of the warrraty claim like blaming us for putting unleaded in it etc but finally they sort of agreed to fix it. Waiting for parts is the excuse now, four weeks later.
The car still drives ok but has a very prononced diesel rattle and sound terrible in underground carparks etc.
AnswerID: 460893

Follow Up By: Rhyno - Monday, Aug 15, 2011 at 12:56

Monday, Aug 15, 2011 at 12:56
How did you go with the warranty ?

I am currently having my 4 injectors replaced under warranty for the same reason you mentioned - was extremely loud on cold starts but was alot better once warm. But mine was an 07 with 95k - so out of warranty, but they said they would cover 100% parts and 50% labour - so total cost of $120....

Picking it up tomorrow so hoping its all fixed!
FollowupID: 736461

Reply By: Michael ( Moss Vale NSW) - Monday, Jul 25, 2011 at 17:07

Monday, Jul 25, 2011 at 17:07
If is an older model with rockers for valve movement, i have seen one broken in half and one with the bottom where the holder sits, broken out. This will give you reduced power as the valve is not being opened up all the way or not at all.. Hope the damage bill is not too high!! Michael

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AnswerID: 460894

Reply By: Mark C - Monday, Jul 25, 2011 at 19:01

Monday, Jul 25, 2011 at 19:01
You will find out for sure tomorrow, but I would think it is valve related due to the noise in the snorkell, something could have gone through bent/damaged the valve and is still bouncing on piston. If you have dropped a valve it would really be banging. Best not to start it unless you have to. Hope I am wrong and it is something simple and cheap.

AnswerID: 460909

Reply By: roger ramjet - Monday, Jul 25, 2011 at 22:35

Monday, Jul 25, 2011 at 22:35

im no mechanic by any means, but "she's not running hot or losing coolant. She's noisy and seems to have reduced power"
and the fact you made it into town would suggest its something less, rather than more, serious.
I'm thinking valve or injector.

Year and model would help to give some braod idea.

My only other advice would be that don't let some mechanic try and hold you to ransom knowing your stuck on your holiday. Ask them exactly what the problem is and get them to show you (the broken parts) and explain it to you in detail. If you have any doubts I'm sure there's a number of good diesel mechs in Katherine only a $50 tow down the road.

good luck, dont stress !
AnswerID: 460935

Reply By: Member - Tony H (touring oz) - Tuesday, Jul 26, 2011 at 10:17

Tuesday, Jul 26, 2011 at 10:17
Keep us informed......
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AnswerID: 460961

Reply By: Joshuah - Tuesday, Jul 26, 2011 at 10:59

Tuesday, Jul 26, 2011 at 10:59
Thanks all. She's in now. It's a 98 hilux 3L diesel. I'm a little worried as the 1st thing they plan to do is change the oil. I hope I managed to talk them out of it.

I rang my mechanic at home and he thought it sounded like the timing belt skipped a tooth. A guy next to me at the park said the same thing when I started her this morn. He thought there was a knocking sound as a result of pre-ignition. I hope to get an update this morning.
AnswerID: 460962

Reply By: Joshuah - Wednesday, Jul 27, 2011 at 08:46

Wednesday, Jul 27, 2011 at 08:46
Mechanic suspects an injector problem, diesel dribbling into cylinder. has ordered 4 from Darwin and should have it done tomorrow if they arrive on time...

Fingers crossed! I'm relieved It's not the head at least.

when I get her back; I'll report back.
cheers Joshua.
AnswerID: 461046

Reply By: Grumma - Wednesday, Jul 27, 2011 at 11:27

Wednesday, Jul 27, 2011 at 11:27

I had a similar problem with my ln106 dual cab 2.8 diesel. Started it up one particularly cold morning, warmed it up, took off for work and about 30 seconds later an awful brrrrr tapping noise from the engine. The noise rose and fell with engine rpm.

Took it straight to the nearest diesel mechanic and by the time I arrived (5 minutes down the road) the noise was gone. He suspected it was a intermittent blockage of an injector.

I dropped the oil and opened the filter; there was no debris so was very relieved.

The noise has not returned.

Good luck - it was very worrisome at the time.

Let us know how it turns out, eh.
AnswerID: 461055

Reply By: trainslux - Wednesday, Jul 27, 2011 at 18:08

Wednesday, Jul 27, 2011 at 18:08
From what you describe it sounds most likely to be injector related.

If you skip a tooth on the timing belt, it will hardly run at all.

A: if your a tooth out on the cam, your pistons meet the valves.= barely running motor.
B: if your a tooth out on the injector pump, it barely runs at all.

You have not mentioned hard starting, or barely running, but more a noise and out of balance, dropped a cyld symptoms. is that a fair description??

On your 3L 2.8 motor,
Sometimes the valve bucket/ shim combo can create noise, but the most common culprit is the injector.

Even touching them with your hands, and feeling for the noise, or using a screwdriver against the injector, and other end against your ear, you will have a good indication as to where the noise is coming from.

Top of motor, and they echo all through the incuction and exhaust system,e ven with a stethoscope there is so much noise going on up there hehe.

Screwdriver of appropriate size/ length is good in an emergency.
I and other mechs have proper stethoscopes for more accurate diagnosis, which helps.

Even cracking the suspect injector to bleed of any possible air, as air can be a culprit of noise, can/ may help in diagnosis, ie crack the offending injector and noise stays or goes away.

hope that helps you understand a bit of what may be going on so your not so helpless.

Let us know what you find.


AnswerID: 461084

Follow Up By: Joshuah - Thursday, Jul 28, 2011 at 08:36

Thursday, Jul 28, 2011 at 08:36
Thanks trains.

I should have been clearer, 3.0l 5L motor, but it. probably doesn't matter much.

It's heartening to hear that injectors may well be the culprit, just given how quick it came on, it sounded like a breakage though I am very happy if its not.

Yes, she starts fine and idles well too, just really noisy and lacking in power. Really looking forward to getting her back and us out of this park!

FollowupID: 734818

Follow Up By: trainslux - Thursday, Jul 28, 2011 at 18:00

Thursday, Jul 28, 2011 at 18:00
Your right, the 3L and 5L are the same motor basically, when it comes to valve bucket shims compared to the earlier 2L motors.

As mentioned before, sometimes air can cause the injectors to hammer quite loudly.

If thats the case, worth checking the air bleed line along the top of the injectors, small pipe that runs between all the injectors and then via rubber hose back to the top of the injector pump, make sure its not blocked, and also the supply from the tank for air just to make sure it dosent happen again.

Very common problem for the fuel filter priming pump to begin to perish, especially after changing a fuel filter, and leak air into the system.
Have you changed the fuel filter before this trip?

Air in a diesel system can cause may problems, ie poor power economy etc.

Here is hoping its something easy like this, or a dud injector.

Other things that the hilux motor is prone to do is the precombustion chamber failing, and falling out of the head and being eaten by the motor.
However if that happened, you would have a very bad miss and poor running, even if it came loose in the head.

Anyway, let us know what you find.

will try and keep an eye on this thread if you have any questions when the mech gets back to you.


FollowupID: 734871

Reply By: Joshuah - Sunday, Jul 31, 2011 at 11:12

Sunday, Jul 31, 2011 at 11:12
Hi. Got car back Fri. Still noisy and blowing some brown smoke, but a little quieter with 4 new injectors. We departed Katherine Sat and 9 km down road motor failed with broken timing belt.

So now in Darwin waiting for plane.

I'm having car brought back home as I never want these turkeys to touch my car again.

Ill be seeking advice given the 1400 spent already and the looming cost. of a rebuild.

On with the holiday!

AnswerID: 461387

Follow Up By: trainslux - Monday, Aug 01, 2011 at 12:26

Monday, Aug 01, 2011 at 12:26
Good greif.

A: sorry to hear of the TB failure, sadly thats lunched the motor, but you already knew that.

When was the belt last done?

B: 1400 for injectors and a diagnosis of noise seems quite excessive, what else did they do to the vehicle when it was there.

C: If it was a timing belt coming apart and causing the noise, that would have been very different to injector noise, and easy to hear the difference as different sound and different place.

D: If you picked it up with it still making the noise, and no better than when you took it in, its easy to say what you should have done now, but was there somewhere else you could have taken the vehicle to?
Reading between the lines, by this time I expect you didnt want them near your car anyway.

Sorry to hear of your holiday disaster.
Hope you can forget about this till you get home and enjoy the rest of your holiday.


FollowupID: 735151

Reply By: Grumma - Monday, Aug 01, 2011 at 22:03

Monday, Aug 01, 2011 at 22:03
Whoa good god sorry to hear of this disaster. The toyotas are normally so reliable. When was the t-belt last changed?
AnswerID: 461556

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