Jump to content

Geofftaylor

TR Register Members
  • Content Count

    15
  • Joined

  • Last visited

Community Reputation

0 Neutral

About Geofftaylor

Profile Information

  • Location
    Devon and Cyprus
  • Cars Owned:
    1959 TR3A in Cyprus 1972 TR6 in U.K.

Recent Profile Visitors

73 profile views
  1. In case anyone is interested the fault on my 3A causing blowback through the front carb was due to a worn cam lobe. Cylinder 1 exhaust was worn quite badly but cylinder 2 exhaust was almost round! The photos show a nice lobe and a very not nice lobe! Prior to discovering this, blaming poor valves, I had refurbished the cylinder head and only noticed the poor valve opening when adjusting the tappet clearances when my head was at eye level with the rockers. My other hand was up inside the wheel arch turning the engine over using my precision made one man crank turning device. (I have no crank handle hole in my radiator now opting for improved cooling over this function).
  2. Following an odd fault in my 3A which I thought was caused by a valve problem I have just overhauled the cylinder head. The initial fault was a severe spitting back through the front carburettor. Unfortunately, whilst reduced, I still have the fault! When setting the tappers I noticed that a couple of the rockers, including No1 exhaust did not depress as much as the other valves. I am now leaning towards a worn camshaft. Anyone have any comments? Could this have caused the initial problem. ie exhaust valve not opening fully. Having just put it all back together I’m not too buoyant right now.
  3. Hi all, Thanks for all the input. The firing order is definitely correct and I now agree that the fault does not lie with the SU’s. I would be surprised if it is a valve as I have had the head off and they are all free in the guides and good contact on the seats. I won’t rule this out however. I did gap the tappets when replacing the head but will do this again along with a plug change and distributor check. The car doesn’t have points which have been replaced with Luminition ignition but the spark is good so don’t suspect that. Geoff
  4. I am now leaning very much towards the problem being on the other side of the block involving the ignition system. I had all of the plugs out cleaned and out back and the chance that they all went back in the same cylinder is low but possible. I intend to start at the plugs and work backwards. I have attached a very short clip, 4.9mb doesn’t give you much, of the noise. Geoff F1673169-41B6-4455-8A29-15D7E9F96859.MOV
  5. Hi guys, it is a bit more than pinking. I’ve had the timing set across a wide range with no difference. Geoff I’m contemplating putting some thicker oil in the damper as the piston does seem to be lifting significantly higher than the other carburettor. I will try swapping the dampers. I’ll try most things now! The odd thing is that I’ve run this car for years with nothing going wrong I couldn’t fathom until now. I am now also thinking that the carburettor is just where the noise is manifesting itself and not the source. It’s not a bearing noise. Geoff Hi Peter, thank you for taking so much trouble to expand your explanation with diagrams which are very comprehensive and interesting. I will have another go this morning and try changing the damper pistons as suggested. I am also contemplating changing the carburettors over to see it the problem moves but this is a fiddly job as all the linkages will need to be changed. It will however determine if the problem is elsewhere. I plod on. Geoff
  6. Hi guys, it is a bit more than pinking. I’ve had the timing set across a wide range with no difference. Geoff I’m contemplating putting some thicker oil in the damper as the piston does seem to be lifting significantly higher than the other carburettor. I will try swapping the dampers. I’ll try most things now! The odd thing is that I’ve run this car for years with nothing going wrong I couldn’t fathom until now. I am now also thinking that the carburettor is just where the noise is manifesting itself and not the source. It’s not a bearing noise. Geoff
  7. Hi guys, it is a bit more than pinking. I’ve had the timing set across a wide range with no difference. Geoff
  8. Hi Rob, Apologies for being a bit vague but I was slowly determining the source by a process of elimination. I initially sounded like it was an exhaust problem and consequently dismantled and reassembled the whole system carefully but the noise continued. I then checked the manifold to head gasket. All was good. The reason I was blaming the front (1&2) carb was, with the air cleaners off and revving the engine whilst looking into the carbs the front one seemed to be the source of the noise. The noise isn’t irregular and, on hard acceleration, sounds like an old tractor going up a hill or a raucous motor cycle engine. (It is a tractor engine but doesn’t normally sound like that!). It can be mimicked to a lesser extent when revving the engine whilst the vehicle is static. The exhaust is tubular stainless. 4 into 2 and the 2 into 1 and then onwards out the back. I am wondering if I am looking in the right place. I am normally pretty good at finding faults but this one is getting me quite frustrated. I did wonder if I was getting spark failure at one plug but haven’t taken that further yet. I have taken a short video but it is obviously more than the 4.9 mb allowed! All suggestions gratefully received. Geoff.
  9. That was my very first idea Rob. Eliminated a couple of days ago.
  10. I have been messing with the carbs this morning and looking at the oil level was one of the first things I checked. Both pistons are lifting on acceleration and, using the screwdriver lift method, seems to be pretty much near enough set to the correct mixture. The noise seems to emit from the front carburettor and sounds like a diesel when accelerating hard in low gears. Maybe the problem lies elsewhere but following a head off rebuild I am struggling now. The car is running very well when cruising.
  11. Thanks for your input. I will check the needle centering. Can’t see why it would have moved since assembly quite some time back but you never know. Dashpots do have oil.
  12. My front SU started to make what sounded to be a backfire under hard acceleration. I decided after a lot of messing about it could be due to valves so took off the head and gave it a decoke (it needed it) and ground in the valves. All looked good. All reassembled, tappers done, timing done, carbs balanced .... no difference. I still have the tractor sound on acceleration which drops right back once cruising. Any ideas.
  13. I will make a fuel change tomorrow. It is a high possibility because nothing else has changed and I have checked the timing and carbs and they are near enough.
  14. Hi all, thanks for your input. I have been through the entire exhaust system, including checking and thus changing the manifold to head gaskets, and all is well. There is a possibility that the knocking could be fuel related as I did use a different fuel recently. I will revert to my usual fuel and see what happens. I am at a bit of a loss with this one.
  15. My 3A has developed a strange raucous noise on hard acceleration. It initially sounded like an exhaust manifold leak but it isnt. It occurs mainly in low gears at pull away but disappears once cruising. Any suggestions before I start wasting my time?
×
×
  • Create New...

Important Information

Please familiarise yourself with our Terms and Conditions. By using this site, you agree to the following: Terms of Use.