Coolant leak / bad head gasket

[dadoke]

Have had an intermittent coolant leak for about a year now, sometimes I find a couple of drops of blue coolant on the floor, other times I don't notice it for a month.
The back of the engine/gearbox/exhaust is always dirty though.



I am not really worried about it actually, there is no power loss, no smoke, engine oil looks perfectly normal ...
Also according to this site having a bad head gasket is quite rare.
And the location of the leak is quite close to the cap with gasket close on the back of the engine, so I was hoping to find the leak there

Thread 'Coolant leak from engine block'

30 November 2018

Found a cap on the engine block with some coolant leak.

Not sure if there is a gasket inside or O Ring or just simple gasket sealant? Can someone tell me which parts is needed or how to fix this can't find any diagram for this section...

• etang789
• coolant engine block leak nsx
• Replies: 8
• Forum: NSX Do-It-Yourself (1st Gen)

Last weekend I decided to investigate, ordered a head gasket tester and a coolant system pressure tester.
The head gasket tester remained perfectly blue, as to be expected.
With the pressure tester it took about 30 min before I found the leak ... and it seems I got "lucky", it's the head gasket!

Leak is located just above the cap, next to the blue dot (see pictures below), only positive news is that it's an external leak...

NSX is a 92 with about 55k km/34k miles.

 

[Honcho]

Yep that's definitely leaking. The older C30 engines are just getting tired. Those head gaskets are 32 years old- even a Honda wears out over time.