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Nissan hardbody
JW:
Ok everything arrived that I need to get the Nissan on the road. Tomorrow Im going to change the fuel pump (its in the tank) and that should make the rev limiter effect go away. If it doesn't then I have a ECM to try... Then I have to replace the con rod bearings, I was waiting for some crocus cloth so I can buff the journals before installing the new bearing shells.
After all that im also replacing the oil pump. Busy but easy day.
Simen:
Some engines has a spring-loaded center-pin on the rotor in the distributor that limits the revs... (It disconnects the center-pin, due to rotational forces - my '91 Audi 100 had that...)
JW:
Hi Simen the rev limiter is controlled by the ECU. Just as an aside it can limit timing and in some cases fuel injector. On this engine the distributor is driven directly with a helical gear to the crankshaft, and uses an optical pickup.
In some cases if the fuel pump cant keep up with flow requirements, it mimic's the effect of a rev limiter. Ive seen it before.
When the engine starts from cold the ignition automatically is advanced until it warms up then the ECU changes the timing back and it decreases the timing and the engine settles down.
I spun the #1 con rod bearing. I worked for about an couple hours burnishing and polished the journal. its doing well and I should be able to get away with. This engine puffs blue smoke so it needs new rings and a rebuilt.
If I can get away with about 20,000 miles from now things will be great. I will just swap a long block.
anyway thinking about this working. I've good compression
This truck has two spark plugs per cylinder.. difficult to tune up.
JW:
Still working on the rev limiter issue. When I was getting the engine up to 6000rpm I spun a con rod bearing. I have been resurfacing the bearing journal by hand with emery and crocus cloth for a copula days..
Today I replaced all the con rod bearings as well as the mains. They were all in bad shape, I glad I got into this while I'm home. As a master mechanic I can tell you, that you can replace the bearings without messing with the crank shaft. The bearings I selected were standard. Next will be the oil pump and after that will be the fuel pump. Once all this is done I will get back to the rev limiter issue. I have a new ECM if the new fuel pump doesn't correct the problem.
Bruce S:
As a mechanic school and military taught , I can also see those bearings ran a little more than low on oil!
Look at those hot spots !
You gonna gauge those out? What's the crank looking like?
I've done a bearing swap on an Olds 455 , it was "FUN".
Have fun :)
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