Don't be me
Veteran Member
Joined: Mar 2015
Posts: 1,307
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From: Evesham, Worcs, UK
Just to remind new owners of the 4.2 naturally aspirated engines that there is in fact a short valley hose (below). It only goes about 6 in into the valley, then loops back to the throttle body. But it's there, and with the 07's coming up on 19 years in service, it's ready to be replaced. Unless there's someone here who says they didn't need to, the intake manifold needs to come off, meaning those gaskets need to be replaced as well.
It's an interesting point that in moving the throttle body from the rear of the manifold on the 4.0 N/A to the front of the manifold on the 4.2 N/A, Jaguar changed manifold removal from a pig of a job to an absolute doddle. This move also simplified the hose routing and replaced the two coolant hoses in the valley with the 4.0 with the one hose in the valley on the 4.2.
However, and it's a big however, they replaced the two simple fixed bore valley hoses which rarely fail with a single hose which is smaller bore at one end than the other and so needs a step-down connector in the run of the hose which is a weak point and is very prone to failing ..... but, at least the manifold is easy to remove when the hose does fail.
Richard
Last edited by RichardS; Today at 01:13 AM.
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