Running to hot

Post by **PaulVW** » Fri Jul 04, 2008 8:06 pm

I have just put a new engine in today. it all seems very nice apart from it seems to be running very hot.

what could be the cause? I think the thermostat is ok, but I will change it tomorrow anyway. If that fails what else could be the problem?

I think my temperature gauge is OK, as on the old engine always run bang on in the middle.

here is a badly drawn pic of where the needle is going.

Post by **ASL642** » Fri Jul 04, 2008 8:41 pm

When you say new do you mean new to the car or just purchased from supplier?

Post by **PaulVW** » Fri Jul 04, 2008 8:44 pm

new as in a second hand one, from a garage floor! as seen advertised here http://www.mmoc.org.uk/index.php?name=P ... ic&t=19750

Post by **RogerRust** » Fri Jul 04, 2008 8:45 pm

If your going to change the thermostat you might as well spend a while flushing the system backwards and forwards until the water flows clean. Simply take one of the heater hoses off and flush it both ways.

Post by **alex_holden** » Fri Jul 04, 2008 10:14 pm

Did you use the temperature sender from the old engine or one that came with the new one? They are supposed to be matched for the gauge to read accurately.

Post by **PaulVW** » Sat Jul 05, 2008 7:29 am

no same temperature sender unit (the engine did not have one)

Post by **PaulVW** » Sat Jul 05, 2008 4:52 pm

changed the thermostat and it have improved a incy bit.

giving it a run to dover tomorow, it will be is first long(ish) run, so I will see what it is like after that. (and stop and let her cool down if she gets to hot)

Post by **bmcecosse** » Sat Jul 05, 2008 10:24 pm

At a pinch - run it without any stat fitted to see what happens. This should not be done permanently - but will be better than overheating the 'new' engine!

Post by **PaulVW** » Sun Jul 06, 2008 5:06 pm

seems to be the same still.

could it be a problem with the timing?

Post by **RogerRust** » Sun Jul 06, 2008 6:04 pm

Does it feel or smell hot? Or even sound hot? Are you loosing any water?

If no or don't know to the above then should be OK.

Post by **PaulVW** » Sun Jul 06, 2008 9:51 pm

well obviously it feels hot

but not "steaming hot" I did not lose a drop of water. Dont know what you mean by sound hot?

it needs tuning anyway, as it is a little "lumpy" when cold, so I may as well do the timing to be on the safe side.

Post by **ASL642** » Sun Jul 06, 2008 9:54 pm

Have you checked the head gasket?

Post by **bmcecosse** » Mon Jul 07, 2008 6:22 am

Well - seriously retarded timing can cause hot running - as can too weak a mixture. Advance the timing till you get pinking - then back it off slightly, and have a look at the spark plugs. Should be nice light beige - if white then dangerously weak.

Post by **beechford** » Wed Jul 09, 2008 11:21 am

why was the engine changed? you could also reverse flush radiator to take that out of equasion,is there a heater ,try flushing this also ceeyas