11 replies to this topic

[P490 LON]

Anybody know what the silver rivet looking thing is? Whats its purpose?

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[ukcooper]

i belive it's to cover up seal a machineing hole what is made in yhe machining process@rover ????  

[cal844]

As above, it's to block a machining or casting hole. It should be ok but I'd advise some form of sealant over the top so it can't come out...

[DeadSquare]

People sometimes used to ask me why there were countersunk wood screws in their castings.

 

It was a case of the casting sand being so fine, that it captured the profile of the screws holding the wooden patterns together, used to make the sand molds.

 

Look very carefully at where you are polishing, if the "silver rivet looking thing" is the same colour as the the rest, it is probably part of the casting.

[nicklouse]

Blanking plug. Often replaced with a blanking grub screw.

[Dusky]

As above, it's to block a machining or casting hole. It should be ok but I'd advise some form of sealant over the top so it can't come out...

How will sealant hold 70 ish pounds of oil.pressure? ?

[DeadSquare]

A wider shot, showing  where it is on the block, might help.

[Spider]

A wider shot, showing  where it is on the block, might help.

 

It's the Oil Way Plug on the relief vent for the Oil Pressure Relief Valve, down about 1-1/2" from the Valve itself.

[cal844]

As above, it's to block a machining or casting hole. It should be ok but I'd advise some form of sealant over the top so it can't come out...

How will sealant hold 70 ish pounds of oil.pressure? ?

Every little helps, they are known to weep, although not alot they can

[P490 LON]

[quote name="nicklouse" post="3605782" timestamp="1562245911"]

Blanking plug. Often replaced with a blanking grub screw.

Is there part number for this? I take it its threaded behind?

[Spider]

[quote name="nicklouse" post="3605782" timestamp="1562245911"]

Blanking plug. Often replaced with a blanking grub screw.

Is there part number for this? I take it its threaded behind?

 

Just to back-step here,,,,,

 

It is a plug in an Oil way drilling in the block (I think we're all on the same page with that).

 

Originally, these were a solid Brass Plug, pressed in.

 

Later in the late 80's or early 90's, they went away from the Brass Plug to a Pop style rivet, like what yours is. These are fine.

 

If you do wish to remove it, usually at the time of a Major Engine Overhaul, it would get pulled so that this oil way can be cleaned out.

 

Rarely, they leak. There's little pressure behind this one, as it's open to vent in to the sump.

 

If you did want to fit a threaded type plug, there's no factory item for this. I tap them 5/16" UNF and fit cup style grub screws, with Loctite for sealant.

 

CAUTION: if you are going to replace it, be sure what ever goes in there isn't any deeper than 10 mm or you'll blow up your Oil Filter among other problems.

[P490 LON]

Cheers for the replies. Will leave it as it is. At least i know its from the factory and not some bodge.