995 valves

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Nick
Posts: 4
Joined: Tue Jul 09, 2019 9:51 pm
Location: Aberystwyth

995 valves

Post by Nick » Thu Jul 11, 2019 6:09 pm

Hi everyone, I am new to this group so thanks for allowing me in, I have a DB995 it was always a bad starter but after last winter it would not stert no matter what I did, so after placing my hand over the exhaust manifold I felt it trying to suck my hand into it, I thought this was not right so I have removed the cylinder head to check inside and found the valves not closing properly, if I pour fuel into the exhaust port it flows freely past the seats, I have removed one of the valves to inspect the seat and found it pitted and very poor, con I buy new valves and recut the seat or could I just lap them in, I am not sure of the angle is it 45degrees for exhaust valves, any advice here would be very welcome as I am no expert but would like to be able to use the tractor now the weather is better.
Thanks in advance to anyone that can offer me some assistance. :roll:

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bedwards1966
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Location: North Yorkshire

Re: 995 valves

Post by bedwards1966 » Thu Jul 11, 2019 8:58 pm

If the seat is in good condition you can usually just lap a new valve in, but really you'd probably be best finding a place that does head work and get them to cast an experienced eye over it and make sure the job gets done right. Generally machining work on heads is pretty cheap.

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cobbadog
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Location: beautiful Coopernook NSW. near Taree. NSW. Australia

Re: 995 valves

Post by cobbadog » Fri Jul 12, 2019 6:31 am

I too would take it to an engineering shop that does this work and let them do the job right the first time. They should be able to re-grind your valves unless they are too fat gone and re-do the seats. This is a quick and simple job for them to do so minimal cost involved.

Nick
Posts: 4
Joined: Tue Jul 09, 2019 9:51 pm
Location: Aberystwyth

Re: 995 valves

Post by Nick » Fri Jul 12, 2019 1:20 pm

Thank you both for your time, I will go to a local engineering company and ask for their advice, before I do something I could regret.

blissakpo
Posts: 59
Joined: Tue Jul 17, 2018 7:15 pm
Location: IRAQ

Re: 995 valves

Post by blissakpo » Fri Jul 12, 2019 5:37 pm

While you have the head off take out the injectors and replace the copper sealing washers underneath them - If they have not been removed for a while the injectors can be difficult to get out and the copper washers bar stewards - The copper washers get stuck in with carbon and its a bit easier with the head on the bench as you can work from both sides.

If you don't and need to pull them at some time in the future there is a particularly useless gadget sold on e bay for pulling the washers out - you poke it down the injector pocket twist it to expand the collet at the end and pull......and the screw end drops off into the piston bore - you have to strip the head off again to retrieve it - been there got the tee shirt so don't waste your money.......just saying:)

If you have not already got one a repair manual will give you the torque settings and tightening sequence for when you come to put it back together. I find a parts book is also useful not only for part numbers but the exploded views give you a clue how things come apart and go back together, it also gives you a clue what it should look like as over the years things tend to not get put back together as they should with bits missing a fairly regular happening.

Try to get the top end gasket set from a reputable source like David Brown Parts - There is a lot of rubbish out there on fleabay and there is nothing worse than doing a job twice.

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GeoffDEAL
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Location: New Zealand

Re: 995 valves

Post by GeoffDEAL » Fri Jul 12, 2019 10:47 pm

Replace the valves,Do Not Use old ones some engines had a habit of the heads of valves breaking off, not just the ones with rotating caps, had a 1200 do it and got away with 2 new pistons but the 1494 put the valve through the head 2 pistons and cylinder head later, replacement valves never gave any problems regardless of aftermarket supplier.

Nick
Posts: 4
Joined: Tue Jul 09, 2019 9:51 pm
Location: Aberystwyth

Re: 995 valves

Post by Nick » Sat Jul 13, 2019 5:58 pm

Hi thanks, blissakpo and Geoff for the added advice, I have purchased a new gasket kit ready and have ordered four new valves to replace the exhaust valves, thinking now maybe I should replace all eight, what do you all think ? Is there an need to remove the injectors or is it something you do as a thinking ahead thing in case I need to remove them later. It's really good to get some first hand knowledgable advice, you just can't beat experience.
Thanks again all. :D :shock:

blissakpo
Posts: 59
Joined: Tue Jul 17, 2018 7:15 pm
Location: IRAQ

Re: 995 valves

Post by blissakpo » Sat Jul 13, 2019 7:06 pm

I cannot really comment on the valves as I have never had one go on me - It is an expensive failure if one does go and while it is to bits you might as well just for peace of mind and save all the hasstle of stripping it a second time. If it was me I would ask the machine shop what they think. If you are replacing the inlet valves I would replace the inlet valve oil seals as well. They are only rubber - not expensive and tend to go hard after time.

I would take out the injectors before I send the head in just to make sure they do not get damaged and as I said they can be difficult to get out. They are supposed to be serviced every (I think, but am going from memory here so someone will probably say otherwise) 480 hours - while the tractor was reasonably new and being serviced by the dealership that was probably the case but as they get to be second or third hand the servicing gets to be less and less as per manufacturers standard and more like "as required" so unless they were playing up they probably have not been out for years and will be very difficult to extract. the copper washers even more so. When I did mine two came out easy with the copper washers stuck on the bottom one was a bit more difficult and the washer more so and the last one took me a week and I ended up cutting the washer in half (very carefully so as not to damage the injector pocket underneath). you need an air tight seal or you will get a carbon build up round the injector and have compression problems.

I would stick an injector service on the list of things to do eventually if they are not causing you any problems at the moment but don't touch them yourself they need to be sent to a diesel specialist to be stripped, cleaned and recalibrated, someone like Sheaf Diesel Services specialise in vintage diesels and can turn them round in a few days.

It's unlikely that the injectors are causing your starting problems - It could be the injector pump or I have known the timing gears to loose a tooth that throws out the timing enough to cause the engine not to start or even something as simple as the lift pump pushrod or old diesel I think I would have dug a bit deeper before tearing it to bits but it's to bits now so you just have to keep digging

Nick
Posts: 4
Joined: Tue Jul 09, 2019 9:51 pm
Location: Aberystwyth

Re: 995 valves

Post by Nick » Sat Jul 13, 2019 8:24 pm

Great detail Blissakpo, I am pretty sure that the lack of compression through the exhaust valves will be the starting problem, I will replace gaskets and seals as I rebuild it up again, it was always reliant on starting fuel to get it going but even that didn't help in the end, I will free off the injectors while its apart but will heed your advice and not meddle with them myself, can you advise the best place to obtain a service manual from please for the torque sequence and settings, it doesn't do much work but would like to use it again. Cheers Blissakpo.

blissakpo
Posts: 59
Joined: Tue Jul 17, 2018 7:15 pm
Location: IRAQ

Re: 995 valves

Post by blissakpo » Sat Jul 13, 2019 8:45 pm

No problem - They need to be worked it's pointless just having it parked up

They do get addicted to easy start

Try David Brown Parts - They have a website and they are all on there (amongst other things) you have to phone or e mail as their website does not take orders but they are good to deal with and very knowledgable. Barclay Williams are another good source of bits especially the hard to find stuff if you are struggling.

Andy

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bedwards1966
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Location: North Yorkshire

Re: 995 valves

Post by bedwards1966 » Sun Jul 14, 2019 9:52 am

If you're removing the injectors (which isn't such a bad idea while the head is off) it wouldn't be a daft idea to send them off to be checked out - round my way injectors are tested for free and you only pay for parts and adjustments, so getting them checked when they're out makes sense.

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ollek
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Re: 995 valves

Post by ollek » Sun Jul 14, 2019 1:10 pm

Doing the valves without checking and repairing (if needed) the injectors at the same time does not sound very clever.

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bedwards1966
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Location: North Yorkshire

Re: 995 valves

Post by bedwards1966 » Mon Jul 15, 2019 12:03 am

Well when you think about it, by the time the engine has gone through a set of exhaust valves the injectors must have seen a considerable amount of work as well. I know I'll certainly be getting mine checked when I do a valve job on my DB.

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