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The IGN Coils. As seen on many NSX, the coils at the rear bank were more or less corroded at their metal core.
Especially, the IGN Coil at #1 Cyl was heavily corroded. While there was no misfire reported from the owner, it is recommend to replace at least #1 CYL IGN Coil as it already expanded and sooner or later, it will cause some problem, possibly at the most inconvenient timing.
Good IGN coil will look like this.
Hope the owner can get hold of the new IGN Coil some point in the near future from US.
Compression test showed standard figure for C30A engine.
The deviation between the cyl was at normal level and it should be minimised once the valve clearance is adjusted carefully.
#6 cyl showed lower figure than others but still well within the window so quite healthy engine.
#1: **2psi, #2: **0psi, #3: **1psi, #4: **8psi, #5:**0psi, #6: **5psi
From here, we just need to keep removing the parts while draining the coolant and try to remove some of the coolant hoses while they are still warm.
New and old header tank.
Draining the coolant from rear engine block using long tube to prevent coolant touching the exhaust.
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As we are going to replace the coolant hoses and engine oil filter, it is best to completely take off the oil cooler from the car.
So, first, drain the engine oil from the oil filter and then remove two coolant hoses.
After disconnecting the cable for one of the Oil pres sensor, the Oil cooler can be removed from the car.
The area is now quite empty as the driveshaft and oil cooler were removed.
Removal of parts countinues…..
Kaz
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Nothing special here. Just keep removing the parts…
After the compression check, I don’t need the battery so just disconnected it. It will also erase any ECL that I may have triggered during the compression check depending on the spec of NSX.
The battery conditioner is connected throughout the service to keep the battery healthy.
ACG removed, checked the bearing and didn’t feel any rattle or noise which was good.
A/C idle pulley removed and again, no noise or rattle from the bearing so it will be re-used.
While the car is in the air, just removed most of the bolts at the TB cover, oil level gauge pipe, brackets, crank pulley, etc before loweing the car.
By the time when I am about to replace the WP, I would like to be in a position to carry out the leak check on cooling system using all the new hoses, tank, O-rings, gaskets, etc so replacing all the parts on the cooling system is the highest priority at this stage.
Thermostat removed.
Part of the black molding started to deteriorate and it was the old original design so good to replace it this time with the latest one.
Nothing new and as seen on other NSX, some of the coolant pipes were corroded.
They will be smoothed out and all of the hose connection points will be applied with rubber grease during the installation of the new hoses and it will add extra protection against future corrosion.
You won’t notice this corrosion until you remove the hose so another important reason to carry out cooling system refresh at a certain interval.
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All the hoses from the engine bay, under the centre floor and the front compartment under the bonnet.
Addition to these, two hoses at the Oil cooler were already removed and there was another one at the header tank overflow port.
So, total of 23 hoses for this NA1 RHD MT non-DBW model.
Time to install the new hoses.
More to follow.
Kaz
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New metal washers and O-rings for the Centre floor drain bolts and radiator drain/bleeder plugs.
Drain bolts at the centre floor pipes torqued to the spec.
Centre floor hoses installed and double checked.
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Front section done. Going to keep the water valve cable disconnected until finishing the bleeding of the cooling system.
Re-surfaced the thermostat housing and the cover.
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New thermostat installed.
Corroded pipes reconditioned.
Engine Bay hoses and the new header tank installed.
Two hoses at the oil cooler will be installed temporary just before performing the cooling system leak check.
So, almost finsihed with the cooling system refresh and moving onto the rest of TB service work.
More to follow.
Kaz
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