y61 got bit warm tugging today

[Thomas-the-Terrano2]

Not had overheating issues before, the noticed on slight grades
at motor way speeds was getting well up scale, pretty much
to the 'H' so eased off and put heat on full into car.

have checked water levels before and during trip and all seems
fine.

ended up in fourth up long bank of M18 towards M1 away from
A1(M) with gauge little lower than H, no overheat warning lamp
AND no check lights, doesnt feel like making usual power either,
this was a reasonably light trip with 1660 kg caravan.

Is due a service before next big trip out to Wales.

have noticed that also has an electric fan in front of rad to one
side, not sure if this is standard, tbh, thought was for aircon
but was definitely spinning when got home and cleared as temp
dropped.

Any thoughts, wasnt even that warm on way home today from
East Yorks.

 

[clivvy]

Thermostat?

as for second fan, isnt that a common modification-to fit an electric fan? or as you say, is it for air con, have you got air con?

 

[Thomas-the-Terrano2]

pop in law following thought 'stat too, yep has aircon though
dont use, well think needs regassing as not very cold.

perhaps another fan alongside existing electric.

the viscous fan on the engine does seem along way from back
of rad, ok theres a nice shrouding for it, but the gap must be
six inches or more, wonder if down to the 3.0 4cyl being that
much shorter than the old 6cyl that filled engine bay...

 

[clivvy]

pop in law following thought 'stat too, yep has aircon though
dont use, well think needs regassing as not very cold.

perhaps another fan alongside existing electric.

the viscous fan on the engine does seem along way from back
of rad, ok theres a nice shrouding for it, but the gap must be
six inches or more, wonder if down to the 3.0 4cyl being that
much shorter than the old 6cyl that filled engine bay...

its probably right, the viscous fan, and the other fan must be for air con although saying that why was it on if the air con isnt running...maybe its wired differently, or maybe it is actually an added electric fan.

id certainly check thermostat though...

 

[solarman216]

Thats the trouble with "wax stats" they fail closed or get lesser opening as they fail, now who remembers the old bellows stats they were great as they failed safe, "open" so main problem was the heater did not get hot, but the engine was safe, Rick

 

[Thomas-the-Terrano2]

so forgive dumbness, but how does a stat fail in this scenario?

on t2 had on that never gave any heat to car heater, replaced
and then found was actually an airlock which when clear got car
much warmer.

on trol getting plenty of heat out of heater, feel was helping
clear excess on engine? or is this just a gesture compared to
what it was doing anyway.

normally gauge never moved above mid way, last time saw needle
try to go so high was on t2 when rad was mudded up and towing.

 

[solarman216]

Wax stats are just that, they have a pellet of wax in a brass container, then a thick rubber seal is fitted which is like a thick "durrex" for need of a better description, ie closed at the end, and into this is a stainless steel pin bout 4 mm diam, very roughly as the wax heats and expands then there is less room for the pin so it is pushed out against the spring, (bit like a lady squeasing hard and forcing you out) and carrying the sealing plate with it opens the waterway, they are very reliable but eventually the rubber fails so gradually the wax is lost, no wax no work, the original wax stats that came out after the bellows jobbies were much less reliable as they relied on a seal around the pin, which very soon failed so wax stats had a poor reception in the early days of wax, but bellows were just not available at a comparative price, Rick

 

[makeitfit]

Reading between the lines here, have you or someone else changed the engine?:augie
Me thinks there shouldn't be a huge gap at all round the viscous fan
Otherwise it's just spinnin' away causing a bit of a draft
When wrapped in the cowl it does a lot more pull through the rad
The elec fan sounds more like the A/C

 

[extreme-4x4]

Wax stats are just that, they have a pellet of wax in a brass container, then a thick rubber seal is fitted which is like a thick "durrex" for need of a better description, ie closed at the end, and into this is a stainless steel pin bout 4 mm diam, very roughly as the wax heats and expands then there is less room for the pin so it is pushed out against the spring, (bit like a lady squeasing hard and forcing you out) and carrying the sealing plate with it opens the waterway, they are very reliable but eventually the rubber fails so gradually the wax is lost, no wax no work, the original wax stats that came out after the bellows jobbies were much less reliable as they relied on a seal around the pin, which very soon failed so wax stats had a poor reception in the early days of wax, but bellows were just not available at a comparative price, Rick

i really must pop over one night, sounds fun in your workshop :bow:bow:bow

 

[solarman216]

i really must pop over one night, sounds fun in your workshop :bow:bow:bow

Never a dull moment here:sly:sly

 

[extreme-4x4]

Never a dull moment here:sly:sly

im in wales for 7 more days , but really gotta meet you when i return to sussex

 

[solarman216]

im in wales for 7 more days , but really gotta meet you when i return to sussex

No problem, just give me a call, if I am about call in, you might get a bit of a supprise we are not the average household, in fact we are a bit way out, give you a clue, we are in the middle of nowhere with no services whatsoever, and it is great, Rick:thumbs:thumbs

 

[briggie]

just a thought ...... are the brakes binding a little on the caravan ? :nenau

 

[Thomas-the-Terrano2]

well all 4 'van wheels spin atleast twice from a push by by hand,
some slight noise suspect the shoes, but otherwise ok.

had car serviced, new oil and filter, air and fuel filter, etc, seems
to be running better, garage couldnt find anything cooling system
wise.

more responsive, wondering if was tired and led to making more
heat, mech said hot engines are tighter and less performance.

thinking oil is primary coolant?

going to get caravan on for a thrash up some of local drags and
see how guage behaives.

 

[Thomas-the-Terrano2]

ordered a stat for y61

car not getting too hot but think when pushing it solo on motorway
the guage moved fromjust under half to just over...

ordered a new stat from milners, about 3rd of price of nissan unit...

seems odd that plenty of heat in heater, could use heater to try
to remove excess heat other week, but wonder if isnt opening
fully.

cant see airlock but think while testing stat easier to swap it out.

wondering if running at half on guage is too much guess could
really do with knowing temp in system.

any more thoughts still very welcome

 

[Thomas-the-Terrano2]

update

had caravan for a test tug round sheffield's hill. out 15 minutes and gauge
skyward.
was going up a decent drag thru houses so nice and slow for ramps too
for traffic calming.

needle got to atleast 3/4s, from normal of just under half at start of hill.

on stopping to examine, found electric fan buzzing away, viscous was
spinning but only by default from being dragged on its drive. let turbo
cool for few seconds. turned engine off and fan blades moved more
freely than when motor cold, actually spinning rather than moving the
gap of one blade as it were.

finallyy back at home with van parked away. the non pressurised water
tank was atleast an inch above max. before now its been like this then
cools say next day. back to normal and coolant returns to engine.

so guess if not for this second expansion tank would be really loosing
liquid, and therefore this is masking overheating too as overall not
appearing to lose any when viewd cold.

Suspect viscous drive at fault., and that best to do pump as well whilst
belt off, stat too?

 

[Timbo_1975]

With the temp gauge elevated from normal position, and definately at 3/4 up, the viscous fan should be locked solid and roaring very loudly with the engine revving.

It sounds like yours is not locking up at all. R&R i'm afraid !

 

[Thomas-the-Terrano2]

cheers Timbo for vote of confidence.

on the old terrano2 it roared like a good 'un,
could hear it a street away and thats I guess
with just warmer than regular and keeping it
down.

only time saw gauge on t2 as far up was towing
smaller old van with rad full of gunge from wading
thru a mud hole the weekend before. gentle power
wash and good as new! it was.

thing is now cant recall haring viscous on troll but
perhaps it wasnt as vocal as the terrano. it towed
to coasts and back previously though without gauge
ever moving.

anyone like to guess price of viscous unit, think seen
milners do pump for about £65.