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Location:
Perth
Registered:
May 2003
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Re: 18r-g tech help. New timing chain causing unhealthy noise!!
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Sun, 04 April 2004 14:27
 
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Setting the valve clearances is a time consuming job.
1. Measure current clearances ensuring that the cylinder you are measuring is currently at the top of the compression stroke. This is done by starting with the engine on number one compression (grooves on each cam facing vertical). Check number one clearances. Turn engine 180 deg clockwise (anti clockwise while facing engine from front of car) and check number three clearances. Turn engine a further 180 deg and check number four clearances. Turn engine another 180 deg and check number two clearances.
2. Now you should have recorded all the current valve clearances on a piece of paper. If they aren't in spec then do the following:
3. Remove both cams, first turn engine back to number one compression (another 180 deg) so the cams are easy to realign later. You can get the cams out with the gears on by backing off the tensioner, removing all the cam retaining caps and removing the front inner cam cap retaining bolts (use two nuts locked together on the stud to remove the stud).
4. Remove buckets but be sure to keep them in the order they came off. Just as they wear into a certain position.
5. Remove shims, these may be stuck under the buckets, KEEP SHIMS IN ORDER!!! EG. Place them on a piece of paper and number the positions.
6. Measure shims using a micrometer.
7. Calculate difference between thickness of shim and valve clearance to work out the new required shim thickness for each valve. Eg, original clearance = 6 thou, shim 80 thou, required clearance 10 thou therefore need a 76 thou shim.
8. Either have shims machined by a machine shop or get new shims. I have heard that if you go to motorbike places they can help. Particularly ones that do Yamahas.
9. Replace new shims in tops of valve retainers IN THE CORRECT ORDER.
10. Replace buckets being careful not to knock shims out of place, cams etc etc.
11. Once cams fitted, double check cam timing, re-check new valve clearances.
Either that or you remove the head, take it to a head shop and they grind the tops of the valves to get the correct clearances - this is expensive though.
PS Expect a large email.
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| | Subject | Poster | Date |
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18r-g tech help. New timing chain causing unhealthy noise!!
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rx793 | Sat, 03 April 2004 15:02 |
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Re: 18r-g tech help. New timing chain causing unhealthy noise!!
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M.W.P. | Sat, 03 April 2004 16:12 |
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Re: 18r-g tech help. New timing chain causing unhealthy noise!!
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Mr DOHC | Sat, 03 April 2004 23:07 |
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Re: 18r-g tech help. New timing chain causing unhealthy noise!!
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people100 | Sat, 03 April 2004 23:10 |
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Re: 18r-g tech help. New timing chain causing unhealthy noise!!
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rx793 | Sun, 04 April 2004 01:15 |
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Re: 18r-g tech help. New timing chain causing unhealthy noise!!
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people100 | Sun, 04 April 2004 09:48 |
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Re: 18r-g tech help. New timing chain causing unhealthy noise!!
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rx793 | Sun, 04 April 2004 12:25 |
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Re: 18r-g tech help. New timing chain causing unhealthy noise!!
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earlyrolla | Sun, 04 April 2004 14:27 |
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Re: 18r-g tech help. New timing chain causing unhealthy noise!!
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Jason | Mon, 05 April 2004 02:49 |
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Re: 18r-g tech help. New timing chain causing unhealthy noise!!
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people100 | Mon, 05 April 2004 08:04 |
