Post Number: 506
|Posted on Tuesday, 01 September, 2015 - 01:08 am: |
Does anyone know offhand the size and grade of the exhaust manifold bolts? I found the top bolt for A1 was missing from my '77 Wraith II after I removed the intake air heater assembly. I suppose it fell out, as there is no broken remnant. Of course, the spacer is lost as well.
Post Number: 27
|Posted on Tuesday, 01 September, 2015 - 01:56 am: |
BOLT.3125UNF X 1.750 LONG
Can't help with the spacer but you could measure one already on.
Hope that helps
Post Number: 507
|Posted on Tuesday, 01 September, 2015 - 02:52 am: |
Thanks a bunch.
Posted From: 18.104.22.168
|Posted on Wednesday, 08 June, 2016 - 12:31 am: |
What wrench (AF,whitworth,mm,) and size of bolt head is it? whats better to release bolt: start engine let it run put CB BLASTER on it overnite. or just turn it cold. thanks
(Message approved by david_gore)
Post Number: 157
|Posted on Friday, 10 June, 2016 - 07:44 am: |
1/2" AF. Soak in penetrating oil overnight.
Post Number: 1550
|Posted on Friday, 10 June, 2016 - 06:10 pm: |
If it is reluctant to come out, try and grab the spacer and turn bolt and spacer at the same time.
Nipping up exhaust manifold bolts and sump bolts are an annual service must.
Often the heads are rusted down so you may have to force on a 12mm ring spanner or socket.
Use good quality tools.
Post Number: 1027
|Posted on Saturday, 11 June, 2016 - 04:49 am: |
Six sided in most cases will work.
Vladimir Ivanovich Kirillov
Post Number: 526
|Posted on Saturday, 11 June, 2016 - 08:16 pm: |
Exhaust manifold bolts are something put on earth to create pain and anxiety in the minds of mechanics. They are nasty horrid things like an eyeball full of petrol.
Randy make sure there is a good thread in the cylinder head before putting a new bolt it and don't put a spring washer on it because that's an exercise in futility. If your thread is gone you will need to helicoil it.
Do have fun.
Post Number: 1031
|Posted on Saturday, 11 June, 2016 - 10:41 pm: |
Be careful they are helicoiled from new!
Vladimir Ivanovich Kirillov
Post Number: 527
|Posted on Sunday, 12 June, 2016 - 06:04 am: |
Ekkk ! I hope Randy's thread is still there then or it could be a nasty little little horror story !
Post Number: 676
|Posted on Sunday, 12 June, 2016 - 10:25 am: |
I did confirm the thread is still there. I understand it is not unheard of that on occasion one or more of these bolts will loosen and fall out. My 1970 Shadow had one missing on the B-Bank. As Paul says, they should be nipped up occasionally. The manifold does not leak at all. I will get on this little project I have been putting off and let everyone know the outcome.I have been quite busy with electrical wiring in my new garage-barn and seems there is always something to do. I tried to start the MGB Friday afternoon and fuel started pouring out from the area where the SU fuel pump is mounted. I looked and did not see anything obviously wrong, so this requires further investigation. Always something!
Post Number: 1552
|Posted on Monday, 13 June, 2016 - 05:14 pm: |
Give the float chamber a tap with a spanner. May just be a sticky valve or float.
The joys of old cars ;)