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deadfish
deadfish

Posted: Sun Feb 27, 2011 8:13am

Post Subject: BMC 1500 oil filter, battery etc.

Hi, I've just aquired a Shetland 570 fitted with an old BMC 1500 diesel mated to an Enfield Z drive that has been sitting on a trailer for the last 10 years. I know these engines are quite old but this is fitted with a dynamo rather than an alternator and has the fitting to take a starting handle. I have several questions, the battery is missing, what amp battery should I get? bearing in mind that a dynamo is fitted will it be positive or negative earth? If I decide to fit an alternator from a breakers at a later date what should I go for and are any wiring alterations difficult? Lastly (for now) the oil filter which is the canister type has been removed, I found the bowl which is very rusty and the large circular plate and spring that fit inside, however I think there are 2 or 3 washers missing, are they just steel washers or rubber? and any idea where I can find a conversion to change to a spin on filter. Many thanks for any help you may be able to provide Nigel

Tony-B
Tony-B

Posted: Sun Feb 27, 2011 9:31am

Post Subject: BMC 1500 oil filter, battery etc.

First the easy part. The filter bowl sits up against a rubber sealing washer it the head and a new one will be supplied with the new element. I have no idea what other washers you are talking about unless the bowl has been overtightened and distorted so it will no longer bolt tight against the head. I must advise that there are so many potential and expensive problems with this boat you should only spend the minimum of money to get it running to test. I suspect the easiest way to solve it may be a transom repair plus outboard. Calcutt Boats or AMC are the inland marine specialists whilst ASAP supplies do most items as well. Any will sell you a conversion kit for the oil filter. You need to look at the battery connections to see if its positive or negative earth. They should have a plus or minus sign on them and the plus has a larger hole than the negative. Then trace the cables. It is normally easy to wire a relatively modern alternator but I am not going to tell you how until you come back and tell me you have it all running and everything works as it should. The starting battery should now be rated in CCA (Cold Cranking Amps) but when the engine was designed it would have had a battery rated at about 80 to 85Ah. However Ahs are now used to designate domestic/house batteries. Tony Brooks

deadfish
deadfish

Posted: Sun Feb 27, 2011 5:13pm

Post Subject: BMC 1500 oil filter, battery etc.

Thanks for the swift reply. I will post how I get on. Nigel

deadfish
deadfish

Posted: Wed Mar 02, 2011 9:26am

Post Subject: BMC 1500 oil filter, battery etc.

Hello, the washers I was refering to in the oil filter are the 2 small ones that are fitted between the spring and the large metal disc that sits under the filter element, these are missing although I can't see what they are actually for. I have now removed the injectors and poured some Redex into the bores and left it to soak. The engine seems to turn ok using the crankshaft pulley. I managed to remove the glow plugs without breaking off the tips. one of the glow plugs appears to have been changed previously but the other 3 have some wearing away at the tips, should they be changed because of this wear, or will they be ok (assuming of course that they are working) Many thanks. Nigel

Tony-B
Tony-B

Posted: Wed Mar 02, 2011 5:52pm

Post Subject: BMC 1500 oil filter, battery etc.

My main concern now is the state of the outdrive so minimising expense is still a priority. You can test the glowplugs with a set of jump leads and the starter battery. That should show those that can be reused at this time. There are two washers missing, in common with a vast number of 1.5s. One is an ordinary steel washer that sits on top of the spring and the other a felt washer that is supposed to make a seal between the large disk and the shaft. The engine will be OK without these washers until you are sure everything works and at that time you can change the filter for a spin-on so there will be no need to worry about them. Tony Brooks

deadfish
deadfish

Posted: Sat Mar 05, 2011 7:43am

Post Subject: BMC 1500 oil filter, battery etc.

Thanks again for your help. Two of the glow plugs are dead as is the starter solenoid so I've ordered a set of glow plugs and will get another solenoid. Are there any checks I can perform on the outdrive before I start the engine? I know its had very little use and the boat has been on a trailer for most of its life, should I first change the oil in the outdrive before starting? Many thanks. Nigel

Tony-B
Tony-B

Posted: Sat Mar 05, 2011 8:51am

Post Subject: BMC 1500 oil filter, battery etc.

Most BMC 1.5s require the pinion throw to be adjusted after fitting a new solenoid (although many get away without). I no longer remember the data so you better check, if it is badly wrong it might knock the end off the starter. First make sure the bottom of the out-drive contains oil and is not dry or full of oily or clear water. The shafts seal is a weak point on any similar device. If it is still full of oil then there is every chance the OD will be OK, but if its dry or full of water my fear is the it may be rusted up inside. You could try selecting ahead and astern to make sure that you can turn the prop in neutral but not in either gear. You could also get someone to turn the engien over with the drive in each gear to make sure the prop turns the correct way. After that you just have to pray the case has not corroded through somewhere and all the seals etc. are still serviceable. Tony Brooks

deadfish
deadfish

Posted: Sun Mar 06, 2011 7:19am

Post Subject: BMC 1500 oil filter, battery etc.

Hi, I didn't know about the adjustment to the pinion throw, it does appear to hit the starter end a bit hard, will get it checked when I get the solenoid fitted. I haven't had time to check the oil in the OD yet but there does appear to be a leak from the shaft seal. Is this a diy job to replace or does the whole of the bottom end have to be stripped out. Thanks again. Nigel

Tony-B
Tony-B

Posted: Sun Mar 06, 2011 9:09am

Post Subject: BMC 1500 oil filter, battery etc.

You can download a manual from http://www.allafloat.co.uk/finestboatuk/manuals/ ENFIELD/Enfield%20Outdrive.pdf (all on one line) and judge for yourself - I have no idea about your DIY abilities. I see the zinc anode that is supposed to protect the leg from corrosion (if it has not been eaten away over time)is directly behind the seal and its retained by a large screwed ring. In my view removing that screwed ring could be very interesting so prepare for a struggle but hope for the best. The first thing to do on that score is to remove the prop. In theory it is just undo the nut and slide the prop off the splined shaft but they can corrode as well, but probably not as badly as the ring nut/case. Last night I had a thought - when deciding the solenoid was faulty did you check the voltdrop between the battery positive terminal and the small single terminal on the solenoid? Any form of resistance on that wire can give solenoid like symptoms, as can worn/stuck brushes in the starter motor. Tony Brooks

deadfish
deadfish

Posted: Sun Mar 06, 2011 3:56pm

Post Subject: BMC 1500 oil filter, battery etc.

Thank you, will download the manual. I borrowed a library book on marine diesels and checked the starter/solenoid as was written. I shorted the two main terminals on the solenoid and the starter worked but shorting the live terminal on the solenoid across to the starter terminal only caused the bendix to throw out, leading me to believe the contacts in the solenoid that close and supply power to the starter are faulty. Unfortunately its an old model where you cannot remove the end to get at the contacts. I phoned a local firm who repair starters etc who agreed that the contacts are the likely cause, so taking it there tomorrow to check. Nigel

Tony-B
Tony-B

Posted: Sun Mar 06, 2011 4:20pm

Post Subject: BMC 1500 oil filter, battery etc.

Its the old ones that you can get the end off - its the new ones with swaged ends that prevent you. However you do have to undo two screws/nuts & unsolder the solenoid windings before you can lift it off. It certainly sounds like the solenoid contacts unless a previous person has fitted the solenoid upside down. Look carefully at the end of the solenoid in the area around where the two terminal big nuts are. The nut with the connection to the actual motor should have a metal plate thing under it extended sideways to allow one of the windings to be soldered to the plate. If that plate is on the battery side terminal you will get those symptoms. Its worth a quick look to save the cost of the specialist. Tony Brooks

deadfish
deadfish

Posted: Tue Mar 08, 2011 4:50pm

Post Subject: BMC 1500 oil filter, battery etc.

Well I've drained the oil from the OD and no sign of any water in there, so good news about that. Unfortunately not so good with the starter solenoid, it's in in for repair or replacement and I had a call today to say that the insides are completely corroded away and he has tried everywhere to get a replacement but because of the age has had no luck. I'm going to search the internet tomorrow to see if I can locate one. Regards Nigel

Tony-B
Tony-B

Posted: Thu Mar 10, 2011 1:23pm

Post Subject: BMC 1500 oil filter, battery etc.

Over the years several starters have been fitted to 1.5s. Very early ones had a two hole mounting flange and if you have one of those I fear you will need a new engien back plate and possibly a flywheel housing so you can fit a three hole starter. The marine specialists are Calcutt boats and AMC/Thornycroft. I have a horrible feeling that it will turn out to be more economic to go straight to the specialists and pay up. Tony Brooks

deadfish
deadfish

Posted: Fri Mar 11, 2011 8:06am

Post Subject: BMC 1500 oil filter, battery etc.

Yes I do have the early starter with the 2 hole mounting flange but the good news is I've tracked down a new solenoid. For anyone else in this position looking for obsolete electrical parts here is the address: esussexautoelectricspares.co.uk

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