Anyone with RB25DET Experience!!!

Post by **JonPowell** » Thu Jun 19, 2003 11:49 am

So I had my motor running for about 10 minutes and heard a loud pop(I thought it was a backfire). The motor stopped running and I had fuel spewing out of the vacuum line on the fuel pressure regulator. I thought for sure that the pop was a backfire from the motor running rich.

I ordered a new regulator 2 weeks ago and am just waiting for it to come in. I got a used regulator from a 300ZX TT and turns out they are the same(43PSI and bolted right to the fuel rail). I put a clear vacuum line on the regulator just to make sure and tried to fire the engine up today. I got ONE tiny pop and niothing else.

I started tracking everythin to find the problem....Fuel-check, CAS working-check, Igniter-check, spark-check, compression-check except for cylinder one.....NO COMPRESSION AT ALL!

I pulled the timing cover to check and see if the belt slipped and the CAS bracket fell right off, broken. the belt had not slipped, the marks lined up perfect....

I pulled the exhaust cam cover and the CAMSHAFT IS BROKEN!!!!!How the hell did the camshaft break????It broke between the 1st cylinder valves, check picture....Anyone got any idea how this happened, the timing belt DID NOT SLIP....

Post by **JonPowell** » Thu Jun 19, 2003 11:49 am

Another pic of the cam

Post by **JonPowell** » Thu Jun 19, 2003 11:49 am

And the crank angle sensor bracket

Post by **Nathan** » Thu Jun 19, 2003 11:49 am

Wow...that really sucks...oh well, I guess it's an opportunity to upgrade. Figure out why it happened first though, that's really weird for a camshaft to break like that...

Post by **FAST-DATSUN** » Thu Jun 19, 2003 11:49 am

Something is wrong with #1 cylinder check the valves and look in the spark plug hole some thing may be in the cylinder. For some reason the cam could not open the valves. Check before going any further!!!!!!!!!!!!!!!!!!!!!!!!

Post by **JonPowell** » Thu Jun 19, 2003 11:49 am

I will be pulling the head tomorrow to see what is happening. I am VERY confused. Do you think I should get some help from the supplier of my engine, if not FULL reimbursement??

Your car is NICE, I like to R32 Taillamps. Nice touch! In the magazine it says your install is 49 states legal, is the RB25DET legal or do you do something extra?

Post by **bmarley5780** » Thu Jun 19, 2003 11:49 am

man that sucks!!! Hope you get things figured out.

Post by **93RPS13** » Thu Jun 19, 2003 11:49 am

definitly you should as for help from your supplierm, man that sucks! i feel your pain, howfully you get some help from the supplier

Post by **FAST-DATSUN** » Thu Jun 19, 2003 11:49 am

First lets see what is wrong with it. We did you get the motor? Did you check it over good before the PRE_oil and start??? Call me for help after 4pm 619-449-4748. We have head gaskets in stock..

Post by **JonPowell** » Thu Jun 19, 2003 11:49 am

Does anybody know if the valves and pistons occupy the same space inside the cylinder? I ran a magnet around inside the cylinder through the sparkplug hole and could not feel anything in there.

Post by **JonPowell** » Thu Jun 19, 2003 11:49 am

Here is a shot of the camshaft out of the car. Broke right in front of the "journal" or bracket or whatever it is called, I cant remember, between the 1st cylinder exhaust valves.

Post by **JonPowell** » Thu Jun 19, 2003 11:49 am

Here is a shot of the head where the camshaft sits. This doesn't look normal, does it?

Post by **SexySil80** » Thu Jun 19, 2003 11:49 am

Talk to your supplier, I'm sure they'd help you out.

Post by **JonPowell** » Thu Jun 19, 2003 11:49 am

Well I found out what the problem is and it looks like the camshaft was bent, I cant explain it but you look at the pics and decide for yourself.

Post by **JonPowell** » Thu Jun 19, 2003 11:49 am

Yet another

Post by **JonPowell** » Thu Jun 19, 2003 11:49 am

And another-the final nail in the coffin

Post by **Nathan** » Thu Jun 19, 2003 11:49 am

Ouch...that REALLY sucks now. Can heads be repaired like that? I've seen heads with screwed up journals/bearing surfaces/whatever you call the place the cam actually rests on and wondered if they can be repaired.

Post by **JonPowell** » Thu Jun 19, 2003 11:49 am

I have no idea if it can be repaired or not, but I have a mechanic who offered to come over & take a look. I will let you guys know. Grumpy, Mack, you got any used heads yet??? This really sucks!!!

Post by **toki** » Thu Jun 19, 2003 11:49 am

use the opprotunity to upgrade to rb26 internals? if possible?

heh

Post by **JonPowell** » Thu Jun 19, 2003 11:49 am

I need someone to fund that expedition, I used all the reserves to get to this point.

Post by **BLue n white R1** » Thu Jun 19, 2003 11:49 am

It actually looks like a siezed cam, but its odd how only part of the cam siezed and it BROKE! on my sr the entire cam siezed, RAN OUT OF OIL, did not get enough oil, .. an dyou can guess what happens from their.

Post by **FAST-DATSUN** » Thu Jun 19, 2003 11:49 am

Yes, we have one complete used head from a motor we recieved with a broken water pump housing..

Anyone with RB25DET Experience!!!

Anyone with RB25DET Experience!!!

Ouch... broken cam

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