Flame Trap 740

  • Thread starter Thread starter Andy
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Andy

850/V70/740

I understand that Volvo in their infinite wisdom decided that the flame trap
on a V70 is no longer required and that it should be removed and discarded.

Does anybody know why they have had this change of heart as clearly they
believed it was necessary when they originally designed the 2.5 engine for
the 850 later used in the early V70's.

Secondly, I am now told by my Ovlov people that the flame trap on our 740
also is no longer required and is to be removed. We have religiously
replaced the flame trap each service since 1989 when we bought the car (an
Ovlov service requirement) so is this actually correct - can we just throw
it out and leave nothing in its place???

Or is it Fords, lets reduce the service cost, influence?

Andy
 
On 740/760/940/960 and others the flame trap is only a trap for non-turbo
engines. On turbo engines the insert is not fitted although the trap body
remains with it's two outlet pipes connected. Usually the smaller pipe (to
the inlet manifold) tends to clog and the pipe becomes brittle on both types
of engine. The small fixed inlet it connects to also needs checking and
cleaning out on all engines.

All the best, Peter.

700/900/90 Register Keeper,
Volvo Owners Club (UK).
 
Peter said:
On 740/760/940/960 and others the flame trap is only a trap for non-turbo
engines. On turbo engines the insert is not fitted although the trap body
remains with it's two outlet pipes connected. Usually the smaller pipe (to
the inlet manifold) tends to clog and the pipe becomes brittle on both types
of engine. The small fixed inlet it connects to also needs checking and
cleaning out on all engines.

All the best, Peter.

700/900/90 Register Keeper,
Volvo Owners Club (UK).
Click to expand...
Where does one find the flame trap? I did the last service on my 940,
and would just like to see what else I should be paying attention to.

Thanks

Simon
 
Usually below the inlet manifold in the area of numbers 3 & 4 cylinders. The
thick pipe leads up from the top of the oil separator, which sits just above
the block/sump line at left rear of engine, to the bottom of the flame trap
body. The top of the flame trap body goes to the throttle body and the small
"Y branch" pipe goes to the top of the inlet manifold (about halfway along)
to a vertical tube inlet.

To improve access there is a kit available to lift the flame trap body above
the inlet manifold. IIRC it consists of a longer thick pipe from the oil
separator.

All the best, Peter.

700/900/90 Register Keeper,
Volvo Owners Club (UK).
 
Peter

Do you think that removing the flame trap on a 740 (B200E K-jet injection)
would cause the lack of accelleration we are currently suffering? Volvo
removed at bthe last service which was 117k miles. Spoke to the Volvo peole
and they say no as it is what Volvo technical now recommend - may be correct
for a V70 but on the 740??

Andy
 
If it was up to me Andy I would put it back as it should be. The flame trap
replacement kits are cheap enough and there is even one which will raise the
flame trap above the inlet manifold (sold by G,S&F). As it should be a
slightly filtered connection for the crankcase pressure to bleed back into
the inlet, making a closed loop, it is quite likely that it will interfere
with the normal operation of the engine.

All the best, Peter.

700/900/90 Register Keeper,
Volvo Owners Club (UK).
 
Ordering today.

Thanks

Andy

Peter K L Milnes said:
If it was up to me Andy I would put it back as it should be. The flame
trap replacement kits are cheap enough and there is even one which will
raise the flame trap above the inlet manifold (sold by G,S&F). As it
should be a slightly filtered connection for the crankcase pressure to
bleed back into the inlet, making a closed loop, it is quite likely that
it will interfere with the normal operation of the engine.

All the best, Peter.

700/900/90 Register Keeper,
Volvo Owners Club (UK).
Click to expand...
 
flame traps are for people who use cheap oil or 710 as the blonde said .With
synthetic oil its not an issue as no gunk is produced .Synthetic oil works
out cheap with less wear ,heat ,and gunk .Have you worked out what 710 is
yet , the blonde was looking at the oil cap up side down wasn't she .OIL
= 710 upside down .(:-{)>
 
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