20 March 2022 Oil in the wrong places

Oil is vital stuff, finding its way between all those rapidly moving metal bits that make the engine go vroom and preventing them from welding themselves together. However, sometimes it escapes from where its supposed to be and then it makes a big mess. Well this evening I was able to look under the bonnet of the MGB to check on some oil misting that has been present since recent start ups. It’s nothing severe, but clearly not right and I wanted to see how bad it was since my first drive a couple of weeks ago. On opening the bonnet there was a tell-tale mark, running transversely across the underside of the bonnet originating from the front of the engine. It wasn’t as severe as the other day, but there is enough to make a mark and not something to ignore. However, I quickly realised that this particular evening I wasn’t going to be able to get under the car to see where the oil was coming from, having checked all possible locations accessible from above where it might be coming from. The pattern of the misting point towards it being linked to the main pulley which as it goes round and round is I think throwing up the leaked oil. Everything points towards the sump, pulley seal or timing chain cover. So a fairly big weekend job there to work through these areas and resolve.

While I was looking, I did a general look around for any other leaks. In the near side chassis rail was some petrol. Not a lot, but a recognisable quantity. Oh dear. I felt around the fuel pipes which were nice and dry and then under the carbs. Aha. Under the front carb (the float chamber) it was damp, so this points towards a seeping seal. Darn. I have had these carbs apart when I was troubleshooting them, so its going to be my fault, but I suspect the float chamber cover seals are not, well, sealing. They were a pig to refit, so I’ll have the carbs off and look/replace the seals as they may well be mangled. Seals are £1.46 from SU (plus £5 for postage!). I am pleased to have spotted this at least before the leak got too bad!

Petrol leaking onto this chassis rail

While looking at the carbs I took a good look at the throttle mechanism as at present the car does not idle nicely all the time. The cable is a little slack but the the spindle returns to the stops so that is not sticking. It could be the mixture as I have fiddled with this in trying to set the carbs up. When I can grab an expert for the day (Hi Dad!) I’ll set these up from scratch, but in the meantime, I took the spark plugs out to see if they would give me any clues as to the mixture. The photos are below in front to back order. I’m going to leave this to the experts to comment, however I think its fair to say the carbs are not set up right!

The off-side chassis rail was also not pristine, having oil spotting around it. I wiped this up and looked for a possible culprit. Feeling under the oil filter, my fingers felt oil around the bottom of the union with the oil cooler pipe. This union is a beast of a with a 15/16th fitting. It a double nut thingy where you have to hold one nut while doing up the other so I had my 15/16th spanner on the oil pipe fitting and an adjustable on the filter end and was able to tighten it by a good quarter turn. I am hopeful that this will stop that leak, but it will need to be checked next time I run the engine.

I tightened up this joint

Finally, one of the grill stays had a loose fitting. No idea why, the grille hasn’t been off for ages, but I might as well fix it while I am here. The threaded screw was a bit second hand looking, so I looked for a replacement. I found a bolt the same thread which was a bit long so I shortened it with the hacksaw and along with a couple of washers it fitted nice and snug and that was one less rattly thing on the car!

Tightened up this grille stay

A busy half hour on the car, but some steps forward which is always good!

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