Tapping From My 92 Ls400

motormaniac · August 25, 2005

Hi guys hope you can help ive just bought my MK1 LS400 (my first lexus) I love it to bits but it seems to have 1 noisy follower/tappet on the ns bank of cylinders can these be adjusted or does it need a new set any info would be appreciated Thanks Jay

andy haw · August 26, 2005

Hi guys hope you can help ive just bought my MK1 LS400 (my first lexus) I love it to bits but it seems to have 1 noisy follower/tappet on the ns bank of cylinders can these be adjusted or does it need a new set any info would be appreciated Thanks Jay

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Search in the forums also USA you will find information.

It seems that valves were a problem on the early Ls 400.

chips229 · August 26, 2005

Its a common thing on the early cars,nothing really to worry about,better that there a little noisey no harm done to the engine,if there to tight then the valves will burn out.

Its a big and costly job to have them adjusted.

Johnny5 · August 30, 2005

It seems pointless however, to run a luxury car, noted for it's refinement, except it sounds like a bag o'spanners....

Save a few quid and trade it in for an old Rover 800!

Alternatively, give it a good thrashing with some oil flush (Tec2000 works a treat) which should quieten any hydraulic valve noises, and then see if it requires any adjustment after an oil change.

I have seen Tec2000 flush work on Fords which sounded like they required new Camshafts! 30 minutes, then silence!

chips229 · August 30, 2005

It seems pointless however, to run a luxury car, noted for it's refinement, except it sounds like a bag o'spanners....
Save a few quid and trade it in for an old Rover 800!

Alternatively, give it a good thrashing with some oil flush (Tec2000 works a treat) which should quieten any hydraulic valve noises, and then see if it requires any adjustment after an oil change.

I have seen Tec2000 flush work on Fords which sounded like they required new Camshafts! 30 minutes, then silence!

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The engine uses shims to gauge the valve clearance and they are prone to slightly more wear on a couple of the shims over time.

Chris.S · August 30, 2005

the valves are hydraulic on Lexus so only thing to change would be valve shims.

if its a tapping you are getting, it may be the EGR pipes at the back of the enginge that have corroded, this is a common problem and soes give a tapping noise

Johnny5 · August 31, 2005

Surely Hydraulic valves are self adjusting, using the oil pressure to quieten them?

I say this because I once had a 12,000 mile LS400 and left it standing for three months.

When I started it, it smoked like a bitch and ratlled like a bag o'nails for around 10 seconds while the oil worked it's way around.

It was fine after this....

Hydraulic tappets can benefit from a good flushing fluid. We use this on every car we service, and you can sometimes hear it work on old gummed up engines!

Some engines have a combination of hydraulic and adjustors, such as the Honda powered Rover 827.

chips229 · August 31, 2005

Surely Hydraulic valves are self adjusting, using the oil pressure to quieten them?
I say this because I once had a 12,000 mile LS400 and left it standing for three months.

When I started it, it smoked like a bitch and ratlled like a bag o'nails for around 10 seconds while the oil worked it's way around.

It was fine after this....

Hydraulic tappets can benefit from a good flushing fluid. We use this on every car we service, and you can sometimes hear it work on old gummed up engines!

Some engines have a combination of hydraulic and adjustors, such as the Honda powered Rover 827.

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I know where your coming from as my old 24V Senator had Hydraulic lifters,but the LS400 has shims like the old Saab 900 engine.