711M Block Twin Cam Oil Passage

[holywood3645]

Hi I'm building a 1700cc twin cam motor to QED spec. I need some advice on the timing cover. It appears there is an oil feed above the jack shaft that may need to be tapped and blocked off. Is that correct? I have included a picture with arrows pointing to the hole. The mating paper gasket and back-plate had no hole or oil gallery in this area.

I read to remove the pin from the main bearing (also visible) which I have done. The cast engine mount on one side has been machined, and the oil pick up for the T/C sump installed. I'm also aware of the taller timing chest spacer and engine breather tube.

Are the any other mods, i need to do? Oil passages I need to block or open up?

Thanks for the advice

James

[types26/36]

It is not necessary to blank that hole off as this gallery is blanked off by the timing cover backplate, the gallery is connected to the where the cam followers fit in the block (OHV engine) the push rods go down the holes to rest on the followers, the gallery is also blanked off at the rear of the engine.
Make sure the oil feed to the chain does not get blocked.
If you have decked the block make sure that the head bolts do not bottom out or the head will not be torqued.
Don't forget the jackshaft needs a spacer with longer dowel and the crank sprocket is a TC type.
Blank off the dipstick hole at rear of engine.
If using the 711 rear oil seal carrier you will need the rear rubber seal from the 711 engine.
The 711 flywheel has the threaded holes for the pressure plate in a different pcd and the Lotus clutch pressure plate will not match up.

[holywood3645]

Hi Brian thanks for the reply. Can you clarify the "Don't forget the jackshaft needs a spacer with longer dowel" I did fit the correct crankshaft spacer along with the standard 711M camshaft (Jackshaft on a TC) and it seems to line up with the crankshaft sprocket. See Picture (s)
I also thought the Kent 711M 1600 cc flywheel and clutch? throw-out bearing were interchangable on the Lotus T/C cpould you claify that also?
Thanks
James

[elanman999]

James,
You say you fitted the "standard 711M camshaft", did you increase the number of oil slots for oil feed to the T/C cams? Also the standard 711m flywheel is a bit heavier than the T/C, though it could be machined to the T/C weight.
Other problems I had were the exhaust hitting on the g/box bell housing and the cam box hitting on the bonnet (+2) both due to the increased height of the engine.
Cheers
John

[types26/36]

Hi James,
Because all the timing components are brought forward 1/4" the TC jackshaft is a fitted with a spacer behind the sprocket and needs a longer dowel pin and bolts to locate it, if you are using the Xflow camshaft (jackshaft) these need to be fitted, if as it looks from your pics you are using the TC jackshaft then that is fine as it is already fitted.
Just as a matter of interest the 711 camshaft is not exactly the same as the TC jackshaft as the TC shaft has extra slots to increase oil supply, the slots can be cut into the 711 shaft but I don't believe it is necessary as I have used the 711 shaft on a TC with no problems.
The Kent 711 was fitted into both the later Escort and Cortina both as a 1600 & 1300 (both are 711 designated with BA for 1600 and AA for 1300) the release bearing was cable operated (at least in the later cars) and the bearing is supported differently as well as a different release bearing. I have adapted this bearing with mods.
The 1300 Escort had a 190 mm clutch plate and the Cortina (in some cases had a 216 mm clutch plate) the four speed Elan has a 8" and the five speed Elan has a 8.5" which is not exactly the same but the Xflow clutch plates can be used.
If you are using the Lotus flywheel with Lotus clutch all will be well but if you are using the 711 flywheel with Lotus pressure plate then Lotus pressure plate will not align with the threaded holes in the 711 flywheel, as noted by previous poster the 711 flywheel is somewhat heavier.
If possible use the Lotus 6 bolt flywheel and clutch as it fits with no problem.
If you use the 711 flywheel with the Xflow pressure plate the pressure plate can catch inside the bellhousing as the shape of it is different to the Lotus clutch pressure plate.
I understand that Ford fitted the 711 Xlow to the Pinto in the U.S. but I am unaware of what configuration, flywheel and release mechanism was used.
Now I am sure you are completely confused by now so I would suggest you post which components and from which engines you are using and pics of the flywheel and clutch parts.

[Foxie]

Hi James,

As has been said, the end plates should seal the oil gallery drillings, but I tap all the openings and fit bsp hex key type blanking plugs. As Paddy says "To be sure, to be sure !"

Sean

Hi I'm building a 1700cc twin cam motor to QED spec. I need some advice on the timing cover. It appears there is an oil feed above the jack shaft that may need to be tapped and blocked off. Is that correct? I have included a picture with arrows pointing to the hole. The mating paper gasket and back-plate had no hole or oil gallery in this area.

Are the any other mods, i need to do? Oil passages I need to block or open up?

James

[types26/36]

[quote="Foxie"] I tap all the openings and fit bsp hex key type blanking plugs. quote]

Well I suppose you could tap and blank off the gallery but I don't really think it is necessary as it is not under main oil pump oil pressure and the gasket and backplate should be adequate.
Attached are some pics showing the different PCD of the tapped holes on a 711 flywheel and a TC flywheel, also the the difference in mass of the two.