Mechanical items are simply
checked by the conventional means. In addition to these usual checks,
some particular features of these cars are – compression test, (high
compression engine) is around 170 – 175 psi on warm engine and wide open
throttle.auto oil seals Benz.
– oil pressure is originally 40psi when properly hot and idling at 7-800RPM. Down to 25psi at idle indicates probably sound, below that is uncertain. (Properly hot – run for 6 miles or so. Do the test drive then check the oil pressure)
– harsh tappet noise indicates worn valve gear. Tappet noise is identified as a tapping sound which doesn’t change its pitch as the engine speed is increased, though obviously it will sound faster.
– piston slap is not uncommon on these engines with moderate mileage due to the short pistons. It is identified as a hollow-ish rattle which is present at idle and reduces substantially and often disappears when the engine speed is increased.auto oil seals Benz.
Gearbox
– cars made 1967 and earlier had no synchromesh on first gear. This first gear was a weak point in these gearboxes and wears out before the rest of the gearbox. As a straight cut gear, this first has a natural whine, however it should be a clean whine not a growly one. If in doubt, get it checked – they are expensive to repair.auto oil seals Benz.
– Reverse in this gearbox is similar, and also has the foible of jumping out of gear if worn badly. Check this by accelerating hard in reverse to about 3000RPM.
– The later gearbox is quite robust, is generally noisy at idle (a hissing noise via the gear lever) and can be difficult to engage reverse. Both these are normal features of this gearbox and indicate nothing wrong. (When it doesn’t go into reverse, put it in first and advance a couple of inches and try again)
If fitted with overdrive (either gearbox), at the end of your 6 mile test run, check that the car still drives properly in reverse. An uncommon but expensive problem is for the overdrive clutch linings to glaze or wear out, resulting in a slipping when trying to reverse. Worse when hot.auto oil seals Benz.
Particular areas to check on an MGB body are:
The sills, which extend under both wings from wheel arch to wheel arch. Particularly check where the wing overlaps. The bottom of the sill, the bit under the car known as the castle rail. It is identified as a rib about 1″ wide running from the front wheelarch to the back of the door where it sweeps up and blends into the rear chassis rail. Check the front of this rib in particular, also the samll triangular bit of vertical panel exposed where at the rear upsweep. Rust in either of these places means major bodywork.auto oil seals Benz.
Check floorpans etc.
Check the steel beadings at the top of the rear wings and where the front wings meet the scuttle (and around the windscreen pillar in a GT). Rust here is not cheap to fix properly.
Check for rust at the top of the rear wheelarch.
Finally, be wary of anywhere where seams usually left exposed (including the aforementioned beadings) have been filled over – this inevitably means a bodge job!auto oil seals Benz.
– oil pressure is originally 40psi when properly hot and idling at 7-800RPM. Down to 25psi at idle indicates probably sound, below that is uncertain. (Properly hot – run for 6 miles or so. Do the test drive then check the oil pressure)
– harsh tappet noise indicates worn valve gear. Tappet noise is identified as a tapping sound which doesn’t change its pitch as the engine speed is increased, though obviously it will sound faster.
– piston slap is not uncommon on these engines with moderate mileage due to the short pistons. It is identified as a hollow-ish rattle which is present at idle and reduces substantially and often disappears when the engine speed is increased.auto oil seals Benz.
Gearbox
– cars made 1967 and earlier had no synchromesh on first gear. This first gear was a weak point in these gearboxes and wears out before the rest of the gearbox. As a straight cut gear, this first has a natural whine, however it should be a clean whine not a growly one. If in doubt, get it checked – they are expensive to repair.auto oil seals Benz.
– Reverse in this gearbox is similar, and also has the foible of jumping out of gear if worn badly. Check this by accelerating hard in reverse to about 3000RPM.
– The later gearbox is quite robust, is generally noisy at idle (a hissing noise via the gear lever) and can be difficult to engage reverse. Both these are normal features of this gearbox and indicate nothing wrong. (When it doesn’t go into reverse, put it in first and advance a couple of inches and try again)
If fitted with overdrive (either gearbox), at the end of your 6 mile test run, check that the car still drives properly in reverse. An uncommon but expensive problem is for the overdrive clutch linings to glaze or wear out, resulting in a slipping when trying to reverse. Worse when hot.auto oil seals Benz.
Particular areas to check on an MGB body are:
The sills, which extend under both wings from wheel arch to wheel arch. Particularly check where the wing overlaps. The bottom of the sill, the bit under the car known as the castle rail. It is identified as a rib about 1″ wide running from the front wheelarch to the back of the door where it sweeps up and blends into the rear chassis rail. Check the front of this rib in particular, also the samll triangular bit of vertical panel exposed where at the rear upsweep. Rust in either of these places means major bodywork.auto oil seals Benz.
Check floorpans etc.
Check the steel beadings at the top of the rear wings and where the front wings meet the scuttle (and around the windscreen pillar in a GT). Rust here is not cheap to fix properly.
Check for rust at the top of the rear wheelarch.
Finally, be wary of anywhere where seams usually left exposed (including the aforementioned beadings) have been filled over – this inevitably means a bodge job!auto oil seals Benz.
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