Another 1hz knock

Submitted: Friday, Aug 16, 2019 at 15:47
ThreadID: 138947 Views:6825 Replies:6 FollowUps:5
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Hey everyone,

1hz with 286,891kms. Has a very slight knock at idle, not apparent when rpm increases. Ticking noise at 1800rpm and 2100rpm. ( mostly noticeable at 80kmph.) Adjusted tappets (they were all slightly tight). Replaced conrod bearings just in case. Replaced injectors. Unsure as to what else it could be?
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Reply By: Member - mark D18 - Friday, Aug 16, 2019 at 16:56

Friday, Aug 16, 2019 at 16:56

Sounds great to me .
Nothing to worry about .

AnswerID: 627302

Follow Up By: Member - mark D18 - Saturday, Aug 17, 2019 at 09:32

Saturday, Aug 17, 2019 at 09:32
Just listened to it again
It’s the same as the six 1HZ Troopie I have owned .
Change the oil every 5 to 8 thousand kms and it will go forever .
You are over thinking it . You don’t need the expense of oil sampling .

FollowupID: 901299

Follow Up By: mountainman - Monday, Aug 19, 2019 at 18:54

Monday, Aug 19, 2019 at 18:54
Expense of oil sampling.
Its pretty cheap.
Under 50bucks easy
Komatsu or Cat dealerships do it
Peace of mind
Why not
Already gone to quite some expense alreasy
FollowupID: 901323

Reply By: Ron N - Friday, Aug 16, 2019 at 17:44

Friday, Aug 16, 2019 at 17:44
Fraser, when you say "conrod bearings", I presume you mean "big end bearings"?

The gudgeon or wrist pin bearings, also known as "little end bearings" are particularly prone to wear in diesels, and these are often the cause of engine knocking sounds.

You can put up with it, or replace them. They rarely wear to the extent that it causes major problems.
I have an Isuzu 6BG1 diesel in my Isuzu truck, with 700,000kms on it, and it has a degree of "gudgeon knock", but it doesn't affect anything, and the engine performs admirably.

Cheers, Ron.
AnswerID: 627305

Follow Up By: Fraser F - Friday, Aug 16, 2019 at 19:00

Friday, Aug 16, 2019 at 19:00
Yeah sounds like it’s a lot easier to just let it go and make sure it doesn’t progress to something worse. Thanks for the reply ??
FollowupID: 901284

Follow Up By: Ron N - Friday, Aug 16, 2019 at 19:32

Friday, Aug 16, 2019 at 19:32
The clearance between the piston pin and bearing is very small, generally less than a thousandth of an inch (0.0254mm).
When this clearance increases to more than that, you start to get "gudgeon knock".

You can get oil sampling done to show if there's an increase in the level of the various metals that make up the engine components.

Doing oil sampling means you can get some warning of engine components that might be failing steadily - and this shows up as elevated levels of the metals comprising those components.

For example, gudgeon/wrist pin/small end bearings, are usually primarily a heavy coating of bronze onto a steel shell.
The bronze in these bearings is comprised of about 80%-85% copper, 6%-8% lead, and 6%-7.5% tin, along with small amounts of zinc and nickel.

When the bronze starts to wear appreciably, you get increased levels of copper, lead and tin in your engine oil.

You start off with regular engine oil sampling to determine a baseline level for the above metals contamination.
Once that baseline is established, regular oil sampling determines whether the metals contamination is steady or becoming elevated.

An elevated level of the metals indicates that bearing failure is likely in the near future.
Accordingly, the oil is also checked for other bearing and component metals contamination, such as aluminium, chrome, and even silver.

Oil sampling is not cheap, but it is an effective method of monitoring engine wear, and picking up the likelihood of an important component failing, and doing highly destructive damage to your engine.

If the potential component failure is picked up early, it can save you a very substantial amount of money.

The 1HZ engine is a pretty robust, long-lived engine, and I have seen many with 500,000kms on the clock, and still performing O.K.

Cheers, Ron.
FollowupID: 901286

Reply By: brianc - Friday, Aug 16, 2019 at 19:15

Friday, Aug 16, 2019 at 19:15
Welcome to 1HZ noise searchers! Mine has had it from 115k when I got it, now 315k, still there. No better or worse. Seems to be better after an oil change. But it returns. I've searched many forums for a silver bullet, but I haven't found an answer yet. Lotsa theories though.
AnswerID: 627308

Reply By: Member - Neil T6 - Sunday, Aug 18, 2019 at 15:18

Sunday, Aug 18, 2019 at 15:18
Interesting that Google gives pictures of big end bearings when you ask Wiki for conrod bearings. After 40 years as a mechanic it's probably the first time I've heard big end bearings referred to as conrod bearings, learn something everyday.
Oil pressure OK at idle? Am I right in assuming you're talking about the dull knock that's a bit more audible when you hold the phone near the wheel?
I owned a 1HZ 105 series for a while, noisest engine I've ever owned but supposed to have a good reputation for doing lots of trouble free miles.
AnswerID: 627336

Follow Up By: Fraser F - Sunday, Aug 18, 2019 at 17:46

Sunday, Aug 18, 2019 at 17:46
Yes dead right about everything, did yours have that same dull knock? - and yes oil pressure is fine.
FollowupID: 901311

Reply By: Allan B (Sunshine Coast) - Sunday, Aug 18, 2019 at 21:37

Sunday, Aug 18, 2019 at 21:37
Hi Fraser,

My Troopy also has the 1HZ engine.

There are a multitude of sounds emanating from my engine, not all "dull", some are quite bright and entertaining. Combined with the sounds from the transmission, tyres and body squeaks it all becomes an elaborate symphony to my ears.

The thing is though..... these engine sounds have been going on unchanged for the whole ten years that I have possessed the vehicle. And although one or two things have broken in the suspension and body, that 1HZ has never missed a beat.

Relax and enjoy the music Fraser..... the 1HZ won't let you down.

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AnswerID: 627341

Reply By: Member - DOZER - Monday, Aug 19, 2019 at 11:07

Monday, Aug 19, 2019 at 11:07
The 1hz makes all sorts of noises, you need a new duke box. It may need a clutch at 500000kms
b4 you bag me out, walk a mile in my shoes, then your a mile away and have my shoes :)

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