The 'E' Type Forum

My US V12 import, although it ran, had low and uneven compression. Bank A 90psi and Bank B 105psi. So putting the horror stories of sheared studs and jammed heads aside I went about removing mine; and whilst I was at it I also removed the sump. Over the period I have asked many questions from you so...

Thank you Marek.

Are you saying that with extended cranking on a car with no lubrication problems, oil pressure might not be sufficient to lubricate bearings?

Regards

David

Thanks guys for your replies!
My car does certainly have a lazy cranking speed. I was just concerned that when cranking for e.g compression testing... that oil might not be circulating. I will get hold of a mechanical gauge to check.

best

David

Ive just rebuilt my heads and installed new rings and shells, honed the bores and installed new spin on oil filter. On cranking the engine (plugs removed) ...I get no oil pressure at gauge...tho I did get oil issuing from slackened cam feeds. A friend of mine (who worked in engine development) sugge...

Thanks for your reply John. I removed the sump and there is nothing trapped causing the distortion. The distortion is on the sump. I did try to tighten the oil cooler bolts to see if the gap disappears when tightened and it did so quite easily. I suspect the distortion was present before I disassemb...

Hi Guys I was replacing my sump back into position having changed the rings and big end shells. I had difficulty in raising the sump into position whilst keeping the gasket in position. I therefore decided to remove the oil cooler to make the job easier...which it did. The sump went in well and I ti...

Good luck with a cheap solution John. Ive been looking at having my '72 roadster resprayed. In 2019 I was quoted 3.5K and in 2022 5K. Stupidly I didn't act and now the cheapest quote Ive had is 12K...and that is with no welding required!! No-one seems to want the work.

David

Hmmm...that's another way of looking at it. However, when the timing mark is on TDC on A1 cylinder, the A1 cylinder is at the top of its stroke.....

Hi All On rotating my engine with head removed in order to de-coke, one of the liners popped up an inch. It went back easily enough... ..however...have I broken a seal...or was it never sealed... Ive read that the compressive force of the cylinder head nuts, with the liners being proud of the block,...

Thank you Marek!

Best

David

Im a bit confused about valve timing setup.

I set cylinder A1 at TDC and could insert a cam setting tool in the slot. However in this position I noticed that on bank B the cam slot is about 1 sprocket tooth out (and cylinder B1 is not at TDC)

Is my timing out?

Thanks

David

Thank you Chris......I found that you cannot drain this coolant from around the liners. I did it by soaking up with rags and hoovering up the sludge. On both banks around cylinders 5 and 6 there was about 40mm of scale grit and sediment. I understand coolant circulation is poor in this area and with...

Having removed my heads I notice that the coolant level is close to top of the top of block. I drained the system by opening radiator tap. I have previously copiously flushed out system but nevertheless there is thick sludge I can feel around the liners. If I release a lower hose will that drain thi...

Hmmm...interesting.....I did notice that at TDC I can get cam set tool on Bank A but in this position Bank B is couple of degrees out... However.... its Bank A that appears poorer compression.... I can see that this might affect a running engine but would this couple of degrees out affect a compress...

Marek...my engine IS an "L" 7.8:1......arę you saying that these test results may be normal for this old engine?

A. 95 95 87 95 93 100

B 110 112 115 115 108 110

Would you recommend 20thou off the head to spice it up a bit?

David

Thank you Marek you have helped me enormously!!

best

David

Thank you Marek...very much appreciated.

Is this any clearer re marks on lobes?

Regarding cylinder liners.....do I really need a tool to prevent the liners moving on a 53 year old engine?

best

David

Hi Guys My 1972 US import roadster (60K miles) has low (110psi) but consistent compression across all cylinders so Im removing head to take a look and a few questions have arisen..... 1/ Ive made up tool to release tension on timing chain. Can I release tension enough to slip sprocket onto bracket (...

Thank you for your advice Bill and Andrew. noted andvery much appreciated.

Ive bought a leak down tester and will perform that over the weekend.....

kind regards

David

Thank you both for your replies.

Bill why do you suspect the engine is poorly lubricated....because it appears so from the pic?

David