TorontoTim Posted July 27, 2012 Report Share Posted July 27, 2012 This morning, I popped out in the TR first thing...everything fine - I know this because I ALWAYS wait for the oil pressure to come up when the engine's cold before doing anything else. 5 minute nip round the block, back home as normal. Half an hour later, start up, pull away, glance at the oil pressure guage....ZERO. Switch off, roll backwards to driveway and push back in. I haven't started the investigation yet, other than to say it's NOT the guage - I connected a spare and also there's no oil coming out of the pressure guage pipe if I quickly spin the engine on the starter. Engine was running ok before I switched off (not NOTICABLY noisy...in the short time it ran). So....Pump failure? Major engine disaster? Pick-up come loose? Waddaya reckon? I'll be spending the weekend investigating...........DAMN! Quote Link to post Share on other sites
stuart Posted July 27, 2012 Report Share Posted July 27, 2012 Pump drive sheared its pin. Stuart. Quote Link to post Share on other sites
Guest ntc Posted July 27, 2012 Report Share Posted July 27, 2012 Pump drive sheared its pin. Stuart. Yep Quote Link to post Share on other sites
TorontoTim Posted July 27, 2012 Author Report Share Posted July 27, 2012 I hope you two are right - I could live with fixing that... Quote Link to post Share on other sites
Ade-TR4 Posted July 28, 2012 Report Share Posted July 28, 2012 Could be even simpler: sump drive shaft too short and has disengaged from pump. There were some rogue drive shafts that were approx 1/4" short knocking about a few years back and only the very tip would reach the pump. Try an uprated/ hardened drive shaft from Cambridge MS for extra peace of mind Cheers Adey Quote Link to post Share on other sites
manray1 Posted July 28, 2012 Report Share Posted July 28, 2012 Enough oil ? Quote Link to post Share on other sites
Ashley James Posted July 28, 2012 Report Share Posted July 28, 2012 Pump drive sheared its pin. Stuart. Stuart As mine's in bits right now till its new crankshaft is fitted can you tell me which bit of the pump drive fails, so I can check mine. Where's the pin? I'm looking at the books and they show a woodruff key at the top. Ash Quote Link to post Share on other sites
Ade-TR4 Posted July 28, 2012 Report Share Posted July 28, 2012 Normally it's the notched bottom end that engages with the pump rotor. Cheers Adey PS - if you slightly peen the woodruff key slot in the shaft, it saves you having to fish around in the sump for the woodruff key when it falls off (ask me how I know this...) Quote Link to post Share on other sites
Ashley James Posted July 28, 2012 Report Share Posted July 28, 2012 Normally it's the notched bottom end that engages with the pump rotor. Cheers Adey PS - if you slightly peen the woodruff key slot in the shaft, it saves you having to fish around in the sump for the woodruff key when it falls off (ask me how I know this...) The tongue you see when you take the pump off or inside the pump? Ash Quote Link to post Share on other sites
Ashley James Posted July 28, 2012 Report Share Posted July 28, 2012 Okay got it! Some wear on end of oil pump drive shaft so another ordered. Ash Quote Link to post Share on other sites
TorontoTim Posted July 28, 2012 Author Report Share Posted July 28, 2012 (edited) Hmmmmm - this doesn't look right to me.... http://i751.photobuc...20728-00309.jpg Nor this... http://i751.photobuc...20728-00304.jpg Diagnosis? Edited July 28, 2012 by TorontoTim Quote Link to post Share on other sites
Ashley James Posted July 28, 2012 Report Share Posted July 28, 2012 (edited) That's a tiny bit worse than mine, but it would still rotate the oil pump. On mine the top of pump rotor is a bit worn too, so I'm replacing the shaft and leaving the pump. My oil pressure was fine but the crank broke. Edited July 28, 2012 by Ashley James Quote Link to post Share on other sites
Guest ntc Posted July 28, 2012 Report Share Posted July 28, 2012 (edited) To much end float in the drive,it has been trying to climb out Edited July 28, 2012 by ntc Quote Link to post Share on other sites
Lord Flashart Posted July 28, 2012 Report Share Posted July 28, 2012 (edited) Tim, There is a pin that goes across the top of the drive that keeps the drive shaft down. Is yours there? Without it the shaft can lift out of the pump even if the end float is correct on the drive. http://www.mossmotors.com/Shop/ViewProducts.aspx?PlateIndexID=36459 Number 32 on the moss diagram. Paul Edited July 28, 2012 by Lord Flashart Quote Link to post Share on other sites
TorontoTim Posted July 28, 2012 Author Report Share Posted July 28, 2012 Tim, There is a pin that goes across the top of the drive that keeps the drive shaft down. Is yours there? Without it the shaft can lift out of the pump even if the end float is correct on the drive. http://www.mossmotor...teIndexID=36459 Number 32 on the moss diagram. Paul AHA! Interesting, I do not have this (well, not any more, anyway ). This would, presumably, allow the driveshaft to "climb out" of engagement with the oil pump shaft, as suggested by Neil. Maybe it's all coming together... Now - what about that f-ed up bush? Quote Link to post Share on other sites
Ashley James Posted July 28, 2012 Report Share Posted July 28, 2012 This is mine, not a good photo, but you can see the wear. I'll check the pin now Ash Quote Link to post Share on other sites
Lord Flashart Posted July 28, 2012 Report Share Posted July 28, 2012 Tim, if the pin is missing, I'd lay money on that being the problem. I've never replaced the bush, but I'd be temped to clean it up a little and reassemble with a new pin and check the end float as per the manual. I'm sure the more experienced will advise on that though. If the bush is easy to change, just fit an new one, they are not expensive. I'd defiantly flush the system through thoroughly as the bits of pin went somewhere and you don't want that in the oil system. Paul Quote Link to post Share on other sites
LGFromage Posted July 28, 2012 Report Share Posted July 28, 2012 My advice is to change the bush as it looks pretty worn. You will regret it if you don't! Tim Quote Link to post Share on other sites
Ashley James Posted July 28, 2012 Report Share Posted July 28, 2012 Most important is to change the shaft amd make sure the slots on the oil pump shaft aren't too far gone IMO. Ash Quote Link to post Share on other sites
TorontoTim Posted July 28, 2012 Author Report Share Posted July 28, 2012 God news is that I've removed and stripped the oil pump. All looks good in terms of clearances and shaft. So, I have a few items to order while the car sits up on axle stands. Damn. Thanks all. Quote Link to post Share on other sites
BlueTR3A-5EKT Posted July 31, 2012 Report Share Posted July 31, 2012 God news is that I've removed and stripped the oil pump. All looks good in terms of clearances and shaft. So, I have a few items to order while the car sits up on axle stands. Damn. Thanks all. Tim, What does the bottom of your drive gear look like? It should be flat. I have a NOS drive gear bush if you want me to do a measure and draw so you can get it made locally. I just checked Moss and they are almost UK £ 50.00 each. It is a lump of bronze with a hole and a shoulder. An hours work on the lathe and then a cross slot with two hacksaw blades in the saw frame. (best solution if you do not have access to a milling machine) Most 6cyl cars have these made from cast iron, so there's another option. Cheers Peter W Quote Link to post Share on other sites
TorontoTim Posted July 31, 2012 Author Report Share Posted July 31, 2012 Hi Peter, Drive gear looks ok - beautiful, in fact! The only real damage on the bush is the cross-slot, but I'm planning to replace regardless. Unfortunately, as the TR is (currently) my daily driver, I have already gone ahead and ordered all parts - they should be here tomorrow. Hopefully, replacing and refitting will cure the problem and I'll be back on the road by the weekend. However, thanks for the kind offer of measurements! I'll provide an update in due course. Quote Link to post Share on other sites
TorontoTim Posted August 2, 2012 Author Report Share Posted August 2, 2012 Once again, thanks to all the forum input and my genius friends on here. Paul's call on the pin in the drive was the key ('scuse the pun) - I'm sure that's what caused the initial problem. And Tim the Cheese was right in recommending replacing the bush...when i drove it out I found that it was TRASHED!!!! Anyway, all back together today (thanks to Moss UK for their next-day service on parts to Canada) and pressure is up and engine sounds happy. Front suspension rebuild next... I'm mostly glad that this didn;t happen on my 1200km trip to NY state or in the middle of nowhere in Northern Ontario (or on a rally). Maybe it's karma because I drive it a lot... Quote Link to post Share on other sites
Lord Flashart Posted August 2, 2012 Report Share Posted August 2, 2012 Exellent news mate. At least it was an easy fix! Paul Quote Link to post Share on other sites
LGFromage Posted August 2, 2012 Report Share Posted August 2, 2012 Glad to hear it is fixed, and so soon too. Tim Quote Link to post Share on other sites
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