Valve adjustment on the 1HZ diesel

I recently set the valve clearances on my 1HZ. I've had the truck for about 45000km and this is the first time that I have set them. I suspect that they weren't done at the 80000km service though as all but one was way out of spec. Most of my inlets had closed to .004" (instead of .008") and exhausts were around .009" (instead of .016"). You can metricize that yourself.

Because so many were out, I removed the camshaft to gain access to the shims. This was straight forward and no major drama. To get the shims out of the bucket, just use a small screwdriver in the base of the slot on the bucket and twist. The oil film holds it pretty securely.

One of the things I didn't have was a shim size-P/N reference so I include it here for your benefit. The shims are marked with a size number only.

Thickness (mm/")           size #          P/N
2.35/0.0925                709             13753-17090
2.40/0.0945                704             13753-17040
2.45/0.0965                710             13753-17100
2.50/0.0984                01              13753-54010
2.55/0.1004                42              13753-54420
2.60/0.1024                06              13753-54060
2.65/0.1043                43              13753-54430
2.70/0.1063                11              13753-54110
2.75/0.1083                44              13753-54440
2.80/0.1102                16              13753-54160
2.85/0.1122                45              13753-54450
2.90/0.1142                21              13753-54210
2.95/0.1161                46              13753-54460
3.00/0.1181                26              13753-54260
3.05/0.1201                47              13753-54470
3.10/0.1220                31              13753-54310
3.15/0.1240                48              13753-54480
3.20/0.1260                36              13753-54360
3.25/0.1280                49              13753-54490
3.30/0.1299                41              13753-54410

Ian B

James Yattras Has done a terrific job of creating an XL spreadsheet that will calculate the required shim from your measurements.

Click here (or right click to save to your computer).