Search found 100 matches

by mc
Sun Jun 30, 2019 6:38 pm
Forum: DBTC Forum
Topic: 990 with hand clutch
Replies: 3
Views: 471

Re: 990 with hand clutch

In the UK the PTO hand clutch was an option on the 990 in the late 1970's, just prior to the introduction of the 90 series, however i cannot remember if it was an option on all versions or 4WD only. Certainly 990 4WD models (VQ cab, DB front axle) seem to have it. This may explain why we did not hav...
by mc
Tue Jan 22, 2019 10:30 pm
Forum: DBTC Forum
Topic: DB 990 Implematic Engine
Replies: 15
Views: 2135

Re: DB 990 Implematic Engine

No, it is actually an AD4/55 (100 mm bore x 4-1/2 inch stroke) similar to a 995/6 but it still retains the AD4/47 crankshaft & connecting rods. As the AD4/47 crankshaft has smaller diameter big end journals fueling should not be increased.
by mc
Tue Jan 22, 2019 8:19 pm
Forum: DBTC Forum
Topic: DB 990 Implematic Engine
Replies: 15
Views: 2135

Re: DB 990 Implematic Engine

With regard to the engine serial numbers on replacement cylinder blocks please find below an extract from DB Technical Bulletin 164 Engine (1343) dated February 1976. "Any AD4/47 engine originally fitted with K961005 cylinder block converted to this specification must be restamped with a prefix 55 b...
by mc
Mon Jan 21, 2019 10:31 pm
Forum: DBTC Forum
Topic: DB 990 Implematic Engine
Replies: 15
Views: 2135

Re: DB 990 Implematic Engine

This is an even later cylinder block than i thought as it has a spin on engine oil filter which dates it from about 1979 onward. Part of the adaptor kit was a new water pump (which your tractor has) to suit the new cylinder block. Also included was an adaptor which replaced the hose tail in the unde...
by mc
Sun Jan 20, 2019 10:53 pm
Forum: DBTC Forum
Topic: DB 990 Implematic Engine
Replies: 15
Views: 2135

Re: DB 990 Implematic Engine

If a just a cylinder block was replaced it did not come with a serial number, the dealer was expected to stamp it which i guess did not always happen. One thing that does puzzle me is the part number K956168F cast into the R/H side of the cylinder block. The "K" prefix on David Brown part numbers wa...
by mc
Sun Dec 09, 2018 12:22 pm
Forum: DBTC Forum
Topic: 1490 injector pump
Replies: 7
Views: 1155

Re: 1490 injector pump

As ollek suggests the first thing you should do is to check that the pump is the correct one for the tractor model. The pump reconditioner will work from the details on the pump identification plate, not the tractor model.
by mc
Sun Nov 04, 2018 7:43 pm
Forum: DBTC Forum
Topic: Serial number list
Replies: 1
Views: 574

Serial number list

Some months ago i saw on this or other website a list of David Brown tractor serial numbers & production dates. It was a hand written list amounting to several pages & in addition to model numbers, serial numbers & production dates etc it also included the serial numbers at which certain features we...
by mc
Sat Oct 13, 2018 4:12 pm
Forum: DBTC Forum
Topic: 885 body variations
Replies: 3
Views: 814

Re: 885 body variations

ollek is quite correct in his summary of cabs although i would like to add the following with regard to the Sekura cab in the UK. Here in the UK we had two versions of Sekura S74 cab as follows. The "David Brown Low Profile Q-Cab" as in the lower photograph was available on the 885, 990, 995 & 996 m...
by mc
Tue Sep 18, 2018 10:28 pm
Forum: DBTC Forum
Topic: 4/47 into a 900
Replies: 6
Views: 1327

Re: 4/47 into a 900

As db2d correctly states, a 990 engine will not fit into a 900 main frame. In general the cylinder block to main frame fitting was the same from VAK1 to 950. This was then changed on the 990 AD4/47 & remained similar up to the end of production in 1988.
by mc
Tue Sep 11, 2018 10:30 pm
Forum: DBTC Forum
Topic: DB 996 serial number help
Replies: 7
Views: 1181

Re: DB 996 serial number help

The numbers are the part numbers for individual casting. 947517 (now K947517) is the front main frame casting on which the cylinder block fits.
by mc
Tue Jul 31, 2018 10:35 pm
Forum: DBTC Forum
Topic: 990 selectamatic water pump
Replies: 3
Views: 851

Re: 990 selectamatic water pump

db2d is correct in his comments. It is possible to fit the current hoses without removing the water pump as they are very thin & supple. However they are not very good quality & being thin do not last very long. If the two hose tails are in line, & the water pump is removed a short piece of 3/4 inch...
by mc
Fri Jul 20, 2018 10:43 pm
Forum: DBTC Forum
Topic: AD3/55 fuel pump cold start assist
Replies: 14
Views: 2658

Re: AD3/55 fuel pump cold start assist

The main seal for the cold start is also available on ebay. Search for "David Brown tractor cold start seal"
by mc
Sun May 27, 2018 5:51 pm
Forum: DBTC Forum
Topic: Case DB Crawlers
Replies: 31
Views: 5649

Re: Case DB Crawlers

When on holiday in Iceland in August 1987 i did see a Case crawler with a DB engine. I cannot be sure of its exact model but i seem to remember it was an 850 (possibly because it was the same number as a DB agricultural model). What i do remember is that it was a 4 cylinder turbocharged engine & had...
by mc
Mon May 07, 2018 10:59 pm
Forum: DBTC Forum
Topic: 990 Fuel Pump
Replies: 18
Views: 3419

Re: 990 Fuel Pump

K909944 is the original one with glass bowl K944997 is the same with glass bowl, but with the top moved round in relation to the base by one screw hole. Both these are replaced by K311939 which does not have a glass bowl. K311939 has now been replaced by 47672994 (without glass bowl) by CNH. All the...
by mc
Thu Jan 04, 2018 11:18 pm
Forum: DBTC Forum
Topic: 880selctamatic
Replies: 12
Views: 2180

Re: 880selctamatic

Could i politely correct something in ollek's last post. The 3-cylinder engine fitted to the 880 Implematic tractor does actually have dry sleeves which if removed leaves a bore of 100 mm. This would then be the same as the cylinder block as fitted to the early 880 Selectamatic with AD3/55 engine. W...