Tests for a slipped liner.

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Tests for a slipped liner.

Post by jenand40 » Wed Mar 13, 2019 10:14 am

I have had a new Rover 4.2 V8 engine sat in the garage for the past 15 or so years and last summer installed it into my Stag to replace a Rover 3.5 V8 engine. On initial start up I ran it for 15 min. at 2000 rpm, I now have a tapping on No.7 cylinder, initially thought it was an exhaust leak, but no. Have replaced the 2 cam followers with Land Rover items but it is still there. There is no sign of oil in water or water in oil.
Could I have a slipped liner? What further tests can I carry out to determine the cause?

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Re: Tests for a slipped liner.

Post by sidecar » Wed Mar 13, 2019 12:38 pm

You could rig something up to pressurize the coolant system to around 15 PSI then leave it for a few hours to see if the pressure falls. If it does fall then it could be a liner issue but it could be caused by a leak else where. Other than that the only other way would involve at least taking the heads off the block.

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Re: Tests for a slipped liner.

Post by DaveEFI » Wed Mar 13, 2019 12:54 pm

The way I check to eliminate it being tappets is to force an old feeler gauge between valve and rocker with the engine idling as slow as possible.
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Re: Tests for a slipped liner.

Post by stevieturbo » Sat Mar 16, 2019 1:09 pm

A slipped or moved liner may have various symptoms...I do not see how a ticking noise would be one of them

Losing/Using water, cooling issues yes....ticking, no.
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Re: Tests for a slipped liner.

Post by garrycol » Sun Mar 17, 2019 1:02 am

A common way of telling which liners have slipped in an engine that has been making the noise for a while is to see which combustion chambers look as if they have been steam cleaned. The cylinders that have slipped will often be perfectly clean from the coolant that gets into the cylinder and is turned into steam by the combustion process and then is exhausted out the exhaust - often the cause of low coolant with no obvious leak.

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