idle speed 1hz non-turbo

Submitted: Tuesday, Sep 01, 2015 at 22:25
ThreadID: 130160 Views:10349 Replies:8 FollowUps:2
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Hi all

Just had my 105 series manual in at the local mechanics today to get the valves checked and a general check over (just bought the car), it currently idles at 900-950 revs when warm a/c off and assume this is a bit high (shouldn't it be around 650rpms? did ask him that but he thought that it's a bit low being a larger diesel??-who am l to argue with a professional?), anyway he thought it is fine, l'm just after a second opinion before l call them again to query it, also they mentioned it didn't need the valves checked as the motor sounded ok, it this right or does one have to visually inspect the valve clearances-have no idea when they were done last-car has done 268 000kms and sounds ok. I have an old bmw boxer motorbike and going by the sound is usually ok (i do adjust these valves myself every 8000kms -very easy to do)- but you do need to aquire an ear for it-so to speak. Just not sure about diesels though as it's my first one.

thanks, Nick
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Reply By: Member - mechpete - Tuesday, Sep 01, 2015 at 23:04

Tuesday, Sep 01, 2015 at 23:04
I would be paying to have the tappets adjusted once ,that way u know they are ok
goin by what they sound like is hardly any guide !!
any comparing it against a BMW motor bike are you serious ??
if you have them set properly once they will be ok for many thousands of ks
AnswerID: 589878

Follow Up By: jack1971 - Wednesday, Sep 02, 2015 at 07:46

Wednesday, Sep 02, 2015 at 07:46
that's what l thought, that's why l wanted them done so l know they're ok. My comparison to a BM bike was because if you can't hear the tappets that means they are too tight-not a good thing (as you probably already know) i.e. you can to a point hear if the tappets are ok, maybe thinking that was the mechanic's logic?? regardless, checking them visually is best. I would have thought the mechanic would be happy to take my money to do it properly.... They are a reputable diesel mechanic in Ballarat.

Is the idle too high, or does it matter??

Thanks for your reply.
FollowupID: 857861

Follow Up By: Rob 49 - Wednesday, Sep 02, 2015 at 08:12

Wednesday, Sep 02, 2015 at 08:12
Hi. Agree with previous post. The only way to check valve clearance in the 1HZ is to remove the rocker cover and associated plumbing and physically check the clearance with a set of feeler gauges and adjust accordingly. Your idle speed is too high. The service manual quotes 600-700 for the manual trans and the auto is 660-760 idling in neutral.
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Reply By: mongrel a - Wednesday, Sep 02, 2015 at 07:54

Wednesday, Sep 02, 2015 at 07:54
just for your info the Toyota service recommend valves be checked every 40,000 km & your idle speed 650 rpm +or - 50 rpm & if you have a idle up switch it is set at 750 rpm + or - 50 rpm mechanic by trade ( land cruiser owner) still on the job but not for long
cheers hope this info is helpful your workshop should have access to this info if they are on the job

AnswerID: 589881

Reply By: Life Member TourBoy, Bundaberg - Wednesday, Sep 02, 2015 at 11:16

Wednesday, Sep 02, 2015 at 11:16
The 1HZ has shims to adjust the valve clearances. These may have to be swapped around and some replaced to ensure correct settings. You need to go to a mechanic that knows what he is doing, yours clearly doesn't as the 1HZ will never be noisy and will always "sound fine". You can't just look you need to measure properly after leaving it overnight.
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AnswerID: 589887

Reply By: B1B2 - Wednesday, Sep 02, 2015 at 12:17

Wednesday, Sep 02, 2015 at 12:17
Go to LCOOL and register. (land cruiser owners on line). You will find everything you need to know about your 1Hz.
v/v clearances can be checked with a feeler gauge and using only 2 positions on the engine. From there you can decide what to do.


AnswerID: 589891

Reply By: jack1971 - Wednesday, Sep 02, 2015 at 17:33

Wednesday, Sep 02, 2015 at 17:33
Well, thanks all for your replies, so much for going to a diesel mechanic?? Anyway, l called the local Toyota dealer and he mentioned that 900rpms at idle is ok, a little high, might be better at 800 but he said not to worry too much about it. The older cruiser's were set at 650-700 but the later ones were set up a little higher.

All l wanted was to lower the idle and set the valves and check whatever settings are needed for a diesel motor, just to know all is ok for another few years. jeez, some things aren't s'pose to be simple are they? Glad they only charged me $50 to check over the car - which l already had done prior to buying it. Anybody know of a 'mechanic' in the Ballarat area that could do this?

AnswerID: 589895

Reply By: Member - Don / Mandy M - Wednesday, Sep 02, 2015 at 20:12

Wednesday, Sep 02, 2015 at 20:12
Had my shims done a few years ago they replaced all the shims from memory it cost around $450, and yes the idle should be around 650rpm.
AnswerID: 589904

Reply By: jack1971 - Wednesday, Sep 02, 2015 at 20:32

Wednesday, Sep 02, 2015 at 20:32
Thanks all, off to buy a workshop manual and am going to check them myself. If they need changing/adjusting then l will return to the 'professionals' and get them to adjust/change the shims. I know it's not difficult, just thought getting a mechanic to do it they might pick up something else while they are dong the valves.
AnswerID: 589906

Reply By: Enormous Racing - Sunday, Sep 06, 2015 at 16:34

Sunday, Sep 06, 2015 at 16:34
My 105 idles at 400 on the dash, I don't believe it. My 75 series idled at 650. I'd like to know how to confirm the idle speed.
AnswerID: 590045

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