Timing cover threaded hole

[Dinorob]

Hi
There is a threaded hole on the timing cover as per photo is it plugged or something else.? If plugged if you can help with size and thread please.

[mbell]

It for a bolt to the head, I think it probably bolt 23 on the diagram:
http://rdent.com/manuals/plus2/engine/ee.htm

Part number: XUCB0516

Which should be 1" 5/16 UNC threaded Hex head bolt.

[Dinorob]

Hi
Thank you for the information, it’s not that one the threaded hole is on the exhaust side of the engine and the size is about 1/2” and open to the inside of the timing cover.

[mbell]

The part listing states there are 2 of those bolts, so my guess is one for the inlet side shown in diagram and one for exhaust side not shown in diagram.

I might be wrong on that but the part list only has those two bolts, the main cylinder head bolts and the cylinder to timing case central bolt. There no bolt shown on the block page either: http://rdent.com/manuals/plus2/engine/ea.htm

So either that bolt or not listed.

Either way it should be the bolt from timing case to cylinder head. So you can confirm the thread size and requirement by measuring the hole on the cylinder head.

[Dinorob]

Hi
I think you’re right, I will check it out in the morning and let you know.
Regards
Rob

[pharriso]

Surely it’s the 2 XUCB0516 shown as #23 in the cylinder head parts list , so threaded 5/16 unc as mark says…

[types26/36]

Deleted!

[ncm]

Hi Rob, As far as I recall the only hole on the exhaust side of the cover that is threaded is for one of the chain tensioner pad retaining screws.
Is this what you are referring to :-

timing chest.jpeg (10.65 KiB) Viewed 614 times

[ncm]

Tensioner pad (number 28), screws (number 29) fitted to the inside of the timing cover.

Brian.

[Dinorob]

Hi All
The problem i had was a very small oil leak from that area and on inspection the oil appears to be coming from that hole that I thought was a open hole in to the timing chain front cover on inspection there is a bolt inside which finishes about 12mm from the bottom i think the oil is tracking down the thread of the bolt or it might be from the rtv silicone sealer in that area more inspection needed.
The bolt in the hole is item 23 as previously mentioned.