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Old 23 Jul 2007
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last on blowback prob -:)

Hello everyone,
Still having problems of blowback, for which I have posted several hreads and had some good replies. As the problem has not been solved here is the full storie with all the details which hopefully bring possible solutions!

The car in question is an old militaryvehicle, from 1986, sold in 2003 to normal citizens. The car is a twin carb v8 3.5 litres. We are not sure wheter engine is pre 1986 or after, as it is a changeover year. It mihght not even be the orgiginal engine as there is a plague saying it was a 2.5 turbo diesel, but this could just been added after.

It has a new waterpump, and the last two parts of the exhaust are new, the coil is new, the distributor seems to be new also.

Two days before leaving the UK we had these two parts of the exhaust changed and used the parts of before the changeover in 1986 as was the advise of the mechanic. Maybe we should have used the parts for 1986 onwards as it was on our first trip leaving the UK that we started experiencing blowbacks. Does anyone have expereince with the resuls of wrong exhaust parts???

The problem is as folllows: there seem to be a small blowout on the exhaust and every so often a blowback (ignition fumes). It feels as if there is a misfiring or lack of fuel, as if someone slammed the brake. The is a sudden loss of power which then just as sudden, after 1-2secs comes back as normal.
Our right carburator (drivers site) damper pops op every couple of hours driving especially when puttin strains on engine such as in hilly areas or high speed motorways. The left damper (passenger side) also comes of every so often but not as much. Our distributor seems new, points are good, wires seem new and have just spaced all wires of away from engine. It is when carb spout pops out and up to the moment of us stopping and putting it back on that car seems to lose power and ability to drive uphill, also affecting excelleration. Machanics checked fuel flow by removing fuelfilter qnd flow was uninterupted. The blowbacks seem to come from where final exhaust section meets the manifold. Of the three bolts connecting these 1 appears loser than the other. A family friend suggested this as the problem yet machanic said a blowout of air is prefereable for engine than leaving hot air in the exhaust. Still we tried tightening it which resulted in the disapaering of the loss of power problem, yet more common blowouts with big bangs. However, not changing anything after the problem came back after a couple of hours. We did fill whole in exhaust but this was blownout soon after (so not such good home repair!!!) and we think this might just be a coincedence.
Problem ccurs mainly on motorway when driving around 65mph, but also around 35 and 15 and at other less specififc intervals.

We seem to have slight ooil leak as we seem to use 1l oil ever 500K. However no visibe leak but droplets have formed on bottom of oil sum. Water also has to be topped very often ( but then we are in Marocco).

The oil in the carbs had evaporated but now been refilled which made no difference (unlike 3rd mechanics assumption). Is it normal for the damper to come off and why is so? We have also just discovered that the two carb spouts are slightly different and have today changed them around to see what happens next.

We have absolutely racked our brains, mechanics either dont know or give incorrect solutions and then dont know. I realise I have bugged this forum already a few times so this will be my last Promise!!!!!!

Many thanks for reading this guys!!!!
Lotty
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Old 23 Jul 2007
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Quote:
Originally Posted by Lotjamie View Post
Hello everyone,
Still having problems of blowback, for which I have posted several hreads and had some good replies. As the problem has not been solved here is the full storie with all the details which hopefully bring possible solutions!

The car in question is an old militaryvehicle, from 1986, sold in 2003 to normal citizens. The car is a twin carb v8 3.5 litres. We are not sure wheter engine is pre 1986 or after, as it is a changeover year. It mihght not even be the orgiginal engine as there is a plague saying it was a 2.5 turbo diesel, but this could just been added after.
Lotty
Hi Lotty

sounds like you are traveling in a MOD Land Rover 110 one of the 1st models..
regarding the blowback... check if the dizzy clamp is loose, may the dizzy turned slightly.
If you had some one fiddling around before you set off, thats may the point.
the other option would be that you had bad or pure fuel some 85 octane or so... in that case your dizzy need to be on TDC ! if fuel between 91 and 95 octan you want 3 degree before TDC. I guess the engine is running lumpy as well.

about the carbs... they are stromberges the ones with a wider carb cab ... right ? well the oil in there... unscrew the little black wheel on top of it and pul the stick out... if you can feel a resisted by let it drop in, the resistance of the ally carb rim and the black lit should be about 1cm ! if more you have to much oil in it, use some WC-paper to suck it out, if less, well top it up a bit.

you will find the LR110 Partsbook for download as PDF file here:
http://www.allwheeltrim.co.uk/Downloads.htm

you may find more help trying some of the clubs on this web link:
All

call RPI enginering and ask for "Holly" only, he is the motorhead and builds all V8 engines... tell him "Hanno" toled you to ask for him
Tel +44 (0)1603 891209 Fax +44 (0)1603 890330

good luck
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Old 23 Jul 2007
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Engine repair manual

just a quick and nasty hack...

I know you are in a 110, but I only have the repair book for a 101FC... well it's the same engine a 3.5 V8 as used in the 1st 110 LR from 1984 to 1986, there is every thing in it to set up the timing and a engine overhaul... it's a big PDF file to download under:
All Wheel Trim Ltd. download page
give me a few minuets to FTP update the web page.
the repair manual will help you a lot !

PDF-page 50 onwards is handling the carb.
one more thing about the blowback... make sure the spark leads are all fire in the right order check page 32 for the cylinder
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Last edited by spooky; 23 Jul 2007 at 20:39.
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