Lotus Elan

Cream evidence and cause?

PostPost by: el-saturn » Sat Sep 01, 2018 7:00 am

the "well done" (by a young (40) ) backplate fixture showed a) a partially wet (water) gasket. b) a delaminated area where there was no adhes?on between gasket and rtv and no rtv on the backplate surface: maybe jetted away by water circulation in the area? WHERE the actual leak is, is hard to determine: the pump housing area also got wet! .......any ideas fellas???? sandy ----- PS QED parts got lost somewheres, 2nd chance on the way?!
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PostPost by: nmauduit » Sat Sep 01, 2018 8:42 am

el-saturn wrote:the "well done" (by a young (40) ) backplate fixture showed a) a partially wet (water) gasket. b) a delaminated area where there was no adhes?on between gasket and rtv and no rtv on the backplate surface: maybe jetted away by water circulation in the area? WHERE the actual leak is, is hard to determine: the pump housing area also got wet! .......any ideas fellas???? sandy ----- PS QED parts got lost somewheres, 2nd chance on the way?!


if there were new parts in that area (backplate ...), you may want to check their planeity before reassembly with high specs jointing compound (not plain silcone)...
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PostPost by: gus » Sat Sep 01, 2018 12:18 pm

Looks like this thread got lifted from the middle of some other thread

it is almost impossible to tell what you are talking bout.

Coolant leak?
maybe timing chest backing plate?

Check flatness of said timing chest backing plate.

I am not sure the backing plate to block surface is a big leak area.

More likely the orings at the water pump.

I doubt the surface requires full contact

If that is what you are talking about, a but cryptic
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PostPost by: alan.barker » Sat Sep 01, 2018 1:09 pm

In the centre around where the Water Pump slides in there is a machined landing with a hole. This hole transfers coolant to the front cover. Many times the leak is here and coolant then drips down into the Sump. :shock:
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PostPost by: Davidb » Sat Sep 01, 2018 5:06 pm

'65 S2 4844
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PostPost by: el-saturn » Sat Sep 01, 2018 9:27 pm

Alan that'd also explain why the Juice squirted upwards and the gasket which somehow had a undegreased surfaceis also part of the Problem??! sandy
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PostPost by: rgh0 » Sun Sep 02, 2018 12:08 am

The other thing to check is that the back plate is not being held of the block front face by the oil gallery plug that fits in a recess in the back plate

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PostPost by: rgh0 » Sun Sep 02, 2018 12:15 am

I would also use Loctite Aviation Gasket Cement on both sides the paper gasket between the back plate and block face not 3 Bond RTV. There is a small oil passage in the back plate for chain lubrication and using RTV risks blocking that.

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PostPost by: 2cams70 » Sun Sep 02, 2018 3:11 pm

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