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Post by Boaty on Jul 3, 2019 18:54:15 GMT
My boat has a TMP gearbox linked to a BMC 1.5. The box is fine at the moment but it is a rare breed indeed and I am just wondering what my options would be if something bad happened. Would it be easy to switch it out for a prm gearbox? Hopefully with lots of tlc and no aggressive use I can keep the box running sweet for a long time yet ,but always good to know the options.
Thanks :-)
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Post by naughtyfox on Jul 3, 2019 18:57:07 GMT
I'd change the gearbox oil often, for starters. Just sayin', like.
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Post by Boaty on Jul 3, 2019 19:04:36 GMT
That sort of thing is part of a regular routine. But sound advice naughtyfox.
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Post by JohnV on Jul 3, 2019 19:14:36 GMT
That sort of thing os part of a regular routine. But sound advice naughtyfox. Don't encourage Foxy, he has an oilchange fetish. Several of us are desperate to find out where he disposes of his so called "used" oil and snaffle it for use in our own engines. Incidentally welcome aboard the Thunderboat, we're mostly harmless Don't ask me about tecknickeral things about gear boxes (I always thought it was a box where you kept your stash) but I'm sure an adult will be along soon with a sensible reply
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Post by Deleted on Jul 3, 2019 19:33:38 GMT
I had a Hurth gear box on a Beta. After 25 years the gear box gave up, and a PRM 120 was fitted as a replacement. I was told at the time that the PRM's would fit any engine. I think a knife wielding, prostitute murdering, Yorkie chomping, funky moped riding member called Mr Stabby has the same engine as you and may offer guidance. @gazza is also technically gifted, although very busy, and he too may be able to assist. Welcome to thunderboat ... and you are indeed welcome etc. etc. Rog
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Post by Mr Stabby on Jul 3, 2019 19:47:45 GMT
I have a BMC 1.5 coupled to a Hurth HB 150 gearbox but you can buy the Hurth gearbox overhaul kits for less than £250 so that's the way I'd go if mine ever packed up and just rebuild it myself. But if your gearbox is working now and you change the fluid from time to time then it will probably still be working long after you have kicked the bucket.
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Post by Boaty on Jul 3, 2019 20:03:00 GMT
I have a TMP gearbox to BMC. A good maintenance regime should keep it going but if did break that will be the end and I'd have to switch. Just wondering how easy it would be to drop in a prm or similar?
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Post by Deleted on Jul 3, 2019 20:09:05 GMT
Wouldnt it depend what broke and how expensive it was to repair? PRM gearboxes are not so cheap, I hear.
In the meantime, gather as much technical data as you can find on the TMP as well as spares dealers, specialist repair services, etc. At the very least, if the worst comes to the worst, it may help to get some money back on it.
Loadsa BMCs have PRM boxes. Cant be too hard!
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Post by Boaty on Jul 3, 2019 20:11:30 GMT
Done all that. The TMP is no longer manufactured and the one man band that did look after them is no longer doing so. This is not about repair but about replacement options if meltdown day ever arrived.
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Post by Deleted on Jul 3, 2019 20:13:40 GMT
I have a TMP gearbox to BMC. A good maintenance regime should keep it going but if did break that will be the end and I'd have to switch. Just wondering how easy it would be to drop in a prm or similar? Not easy, the flywheel is machined to take drive bobbins. I'll try to find a picture of a Perkins 4107/8 flywheel so you can see what I'm on about. Does it have a spin on or paper element filter? If you are not sure take a picture and post it up. They are a good box, capable of dealing with 45+ bhp on a Perky. The BMC won't stress it, rough use and lack of yearly oil changes will - oil is 15/40 mineral CF grade, do not use ATF or EP 90! Take your time going from forward to astern (and vicey versy) pause at neutral and then snick it in, try not to bang the throttle on hard straight away either. Attention needs paying to the oil cooler hose tails, they can corroded and give all sorts of headaches. Is this engine and box keel or raw water cooled?
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Post by Boaty on Jul 3, 2019 20:21:36 GMT
Hi Gazza, it is splined I am informed. The drive bobbins are apparently peculiar to Perkins I understand. It has a spin on filter. Thanks re oil, the data on the one man band's website says just use the engine oil. The engine is keel cooled so rusting is not an issue - provided the antifreeze is ok.
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Post by Deleted on Jul 3, 2019 20:24:52 GMT
Is the gearbox making unusual noises?
Some sort of grinding type noise maybe.
Not quite sure if it is a tmp but my friend has a 1.5 with a hydraulic box (not prm or Borg warner) which specifies monograde 30 oil. Obviously a multigrade would cover that anyway.
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Post by Deleted on Jul 3, 2019 20:36:53 GMT
Hi Gazza, it is splined I am informed. The drive bobbins are apparently peculiar to Perkins I understand. It has a spin on filter. Thanks re oil, the data on the one man band's website says just use the engine oil. The engine is keel cooled so rusting is not an issue - provided the antifreeze is ok. A quick check reveals sone are indeed splined at 26 Teeth/Splines. That makes life easier, you'd need a different adapter plate - I have one kicking about but can't remember what SAE pattern it is; they are hard to get hold of and need the flywheel removing to change. Good news on the oil filter, much easier to get hold of a filter for that box, the element requires a little bit of work to get an OX15 Mahle filter to fit, easy enough when you know how An oil pressure gauge is a good idea if you don't have one, a good functioning box should be 70+ psi.
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Post by Deleted on Jul 3, 2019 20:39:58 GMT
Is the gearbox making unusual noises? Some sort of grinding type noise maybe. Not quite sure if it is a tmp but my friend has a 1.5 with a hydraulic box (not prm or Borg warner) which specifies monograde 30 oil. Obviously a multigrade would cover that anyway. The Borg Warner box is the bollox 👍🍻 I'd want one over a Hurth or PRM Newage manual boxes were common on the vedette - I don't recall the manual asking specifically for a straight 30 oil. 20/50 is still easily available and perfectly adequate for the job on a box like that
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Post by Mr Stabby on Jul 3, 2019 21:04:55 GMT
Is the gearbox making unusual noises? Some sort of grinding type noise maybe. Not quite sure if it is a tmp but my friend has a 1.5 with a hydraulic box (not prm or Borg warner) which specifies monograde 30 oil. Obviously a multigrade would cover that anyway. The Borg Warner box is the bollox 👍🍻 I'd want one over a Hurth or PRM Hurth are good gearboxes, they are made by ZF Friedrichshaven, and ZF gearboxes are a standard fitment in Volvo trucks, Aston Martin, Rolls-Royce, BMW, Toyota, Alfa Romeo cars etc.
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