Jump to content
View in the app

A better way to browse. Learn more.

300ZX Owners Club

A full-screen app on your home screen with push notifications, badges and more.

To install this app on iOS and iPadOS
  1. Tap the Share icon in Safari
  2. Scroll the menu and tap Add to Home Screen.
  3. Tap Add in the top-right corner.
To install this app on Android
  1. Tap the 3-dot menu (⋮) in the top-right corner of the browser.
  2. Tap Add to Home screen or Install app.
  3. Confirm by tapping Install.

I just had a nasty thought. I've read about head problems with early models - ie 89 and 90. I have... head problems on an F reg. :slap:

 

Does anyone have any more details on the known problems?

Featured Replies

You got an F? Wow, there cant be many of those about! Makes my G sound new ;)

 

I have heard mention of possible problems also, but its survived 13/14 years so far hasnt it lol?

I think any design problems would have worked their way out of a 15 year old car by now!

Ah but it was modded quite late in the ownership history and the owner who put most of them on only drove it a few k. At the time I thought that was a good thing, but now, I'm not so sure!

 

IOW if it is just a weak example it might not have shown up until now anyway.

 

OTOH all the other stock bits are still fine, eg, suspension, diff, prop, gearbox...

 

Might not "really" be an F because the DVLA plate them as late as they are certain of, so unless the importer looked up the engine number they probably couldn't pin down F or G. (There was a thread on this a while back.)

what no is your engine?

I think there was a problem with the bore for the CAS being off centre on certain years (1990??) so the CAS keeps breaking.

Try a search on TT net, I'm sure it was on there I saw it.

Like an idiot I don't have a seperate note of the engine number so whilst it's in the garage I've no idea...

 

Unless it'll be in the HPI paperwork?

The face of the head wasn't machined perpendicular to the cam so over time, the CAS shaft ran at an angle to the cam causing its drive spline to wear and eventually break. I seriously doubt you will have one of these though as there were only about 250 heads that were like this afaik.... Then again, its not impossible! What are the head problems you're having???

Duff, everyone's prolly sick of me bleating on about it now. :D

 

HG went at 63kish - (only 2.5 of those k mine!). Annoying because I'd obviously just done 60k service, plus water pump and viscous fan, then of course the whole lot had to come apart again...

 

Skimmed, rebuilt, got it back, another 3k miles and took it out for a spin for final time before oil change and new tyres - and it died on the motorway. I'd hardly been into +ve boost for the whole journey but it was certainly running fine until that point. Left bank mega smoke out of the exhaust etc, missing all over the place, so I knocked the engine off before it ran the oil dry and coasted it to a stop.

 

When I went back to it with the low loader there was mayonnaise in an impressive stream running out from under it!

 

I've mostly run .7 bar (with the OCCASIONAL) 1bar when impressing passengers, so not really excessive by the standards of this forum, chipped, AVC-R, uprated breathing, that's about it. Don't buy the first one you look at eh?

 

I've not had problems with timing so far as I can tell - certainly I've never had det according to diags and nor have I heard any (although hard to tell with noisy lifters I guess) and it's always been running smoothly. Don't think therefore I've ever had CAS probs!

AFAIK that was the only problem with the heads on early engines!

 

I think the best thing to do would be to get both heads replaced with some s/h ones. However it sounds to me like the job wasn't done properly in the first place if they only lasted that long after a skim and rebuild! Of course things *can* happen on a freshly rebuilt engine but at the same time its fairly rare ;)

 

How have the HGs been blowing? Oil-water ways?

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Unfortunately, your content contains terms that we do not allow. Please edit your content to remove the highlighted words below.
Reply to this topic...

Recently Browsing 0

  • No registered users viewing this page.

Important Information

Terms of Use

Configure browser push notifications

Chrome (Android)
  1. Tap the lock icon next to the address bar.
  2. Tap Permissions → Notifications.
  3. Adjust your preference.
Chrome (Desktop)
  1. Click the padlock icon in the address bar.
  2. Select Site settings.
  3. Find Notifications and adjust your preference.