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Old 12th October 2019, 22:30   #41
SD1too
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You're close; three! But the number of belts isn't the issue. The challenge is that when the primary belt is released, all four camshafts move. Two sprockets then have to be held in a precise position (against valve spring force) whilst the new belt is threaded around the water pump, idler wheel, crankshaft and hydraulic tensioner. Trying to do that single-handed using Tippex marks really is a folly.

Simon
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Old 13th October 2019, 19:11   #42
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Thinking about it, on the twin cam engines I have worked on, there was usually a way of locking the camshafts, either with a toothed insert between them or bolts through a spoke into the head. I always tippexed marked all sprockets, just in case I lost the timing/dropped the locking device. Some timing marks are very indistinct.
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Old 13th October 2019, 19:31   #43
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The tools for locking the camshafts in the KV6 are available from Rimmers at the bargain price of £318 + shipping! https://rimmerbros.com/Item--i-RX1609
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Old 13th October 2019, 19:55   #44
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Quote:
Originally Posted by SD1too View Post
You're close; three! But the number of belts isn't the issue. The challenge is that when the primary belt is released, all four camshafts move. Two sprockets then have to be held in a precise position (against valve spring force) whilst the new belt is threaded around the water pump, idler wheel, crankshaft and hydraulic tensioner. Trying to do that single-handed using Tippex marks really is a folly.

Simon
I wonder if there is anyone on the forum with those tools and if they would hire them out to another forum member.
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Old 13th October 2019, 20:05   #45
SD1too
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Quote:
Originally Posted by stevestrat View Post
The tools for ... the KV6 are available from Rimmers at the bargain price of £318 + shipping!
If this is Laser Tools part no,. 4577 then it's the sensible choice at £190! (There are other options).

Quote:
Originally Posted by Comfortably Numb View Post
... on the twin cam engines I have worked on, there was usually a way of locking the camshafts ..
The KV6 is, of course, a quad cam engine and there IS a way of locking the camshafts: use the service tools!
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I always tippexed marked all sprockets, just in case I lost the timing/dropped the locking device.
The KV6 service tools make Tippex marks redundant. They're unique in that they lock the camshafts but allow rotation of the sprocket wheels which greatly assists the belt lacing process. If you ever come to do it, you will understand what I mean.

Simon
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